ci: Rewrite clang-tidy workflow(s) in a reusable manner

[mathbunnyru]

High Level Overview of Change

There are multiple improvements in this implementation:

• determine-tidy-files.yml is moved to XRPLF/actions. The reason I kept it a workflow and not an action - there is no way in GitHub to break execution of steps and return early. So, if it were an action, every subsequent step would have been if: need_to_run.
• We only have one workflow to call, with sane params, instead of 2, so it's much easier to follow what's going on
• That workflow is divided better into jobs and steps. For example, instead of one huge chunk of issue creation, there are now several parts
• Jobs now only have minimal permissions, that's why actual issue creation is separate
• Artifacts are uploaded without a zip (it makes it easier to work with them locally)

So, from the perspective of workflows, it's a rewrite.

Context of Change

API Impact

• Public API: New feature (new methods and/or new fields)
• Public API: Breaking change (in general, breaking changes should only impact the next api_version)
• libxrpl change (any change that may affect libxrpl or dependents of libxrpl)
• Peer protocol change (must be backward compatible or bump the peer protocol version)

[Copilot]

Pull request overview

Reworks the clang-tidy CI implementation to use a single reusable workflow with a dedicated reusable “determine changed files” workflow and a separate job for issue creation, aiming for clearer structure and reduced permissions.

Changes:

• Introduces .github/workflows/determine-tidy-files.yml to compute clang-tidy targets/flags based on changed files.
• Rewrites .github/workflows/reusable-clang-tidy.yml to run clang-tidy directly (build/setup + run + artifact/issue-body generation) and split issue creation into a separate job.
• Removes the older per-file reusable workflow and updates trigger workflows accordingly.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
.github/workflows/reusable-clang-tidy.yml	Consolidates clang-tidy execution into one workflow, adds build/setup steps, artifacts, and a separate issue-creation job.
.github/workflows/reusable-clang-tidy-files.yml	Deleted legacy workflow previously responsible for running clang-tidy and optionally creating issues.
.github/workflows/determine-tidy-files.yml	New reusable workflow to detect changed C++/clang-tidy config files and output target lists.
.github/workflows/on-trigger.yml	Removes reference to deleted reusable-clang-tidy-files.yml.
.github/workflows/on-pr.yml	Removes reference to deleted reusable-clang-tidy-files.yml.

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[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.

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[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

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[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated 6 comments.

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[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

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[mathbunnyru]

There are no actual new checks here, only the file is now sorted
This helps to launch the clang tidy workflow (I also checked that without changing this file, it's not actually launched; and changing only C++ files works as well)

[mathbunnyru]

This is the incorrect type, and my editor was complaining.

[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated no new comments.

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[mathbunnyru]

This file and a few others don't exist (Copilot correctly complained), so I removed them in this PR, since I changed this list of files

[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.1%. Comparing base (8490206) to head (ab99e1a).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop   #7062     +/-   ##
=========================================
- Coverage     82.1%   82.1%   -0.0%     
=========================================
  Files         1010    1010             
  Lines        76033   76033             
  Branches      7375    7368      -7     
=========================================
- Hits         62418   62411      -7     
- Misses       13615   13622      +7     

see 5 files with indirect coverage changes

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[github-actions]

This PR has conflicts, please resolve them in order for the PR to be reviewed.

[github-actions]

All conflicts have been resolved. Assigned reviewers can now start or resume their review.

[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated no new comments.

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