Use GH actions concurrency to cancel runs

[lars-reimann]

Fixes #920

Proposed Changes

1. Use workflow concurrency instead of skip-duplicate-actions
2. Update mega-linter-runner template
3. Add a regex replacement to the updater (job removal + comment removal)

Capabilities of the regex:

• Works with varying whitespace (including indentation)
• Keeps any jobs that come before or after the cancel_duplicates job.

Downsides of the regex:

• It will not work if the user has renamed the cancel_duplicates job. I don't see a way to reliably fix this, however.
• It removes comments between the end of the cancel_duplicates job and the start of the next. This can be fixed by matching the end of the cancel_duplicates job more exactly, but that again makes it more likely that the automatic update fails if the user has changed the workflow.

Readiness Checklist

Author/Contributor

• If documentation is needed for this change, has that been included in this pull request

Reviewing Maintainer

• Label as breaking if this is a large fundamental change
• Label as either automation, bug, documentation, enhancement, infrastructure, or performance

[codecov-commenter]

Codecov Report

Merging #921 (e00bdac) into main (f0d359c) will increase coverage by 0.03%.
The diff coverage is n/a.

❗ Current head e00bdac differs from pull request most recent head 83a9e58. Consider uploading reports for the commit 83a9e58 to get more accurate results

@@            Coverage Diff             @@
##             main     #921      +/-   ##
==========================================
+ Coverage   87.46%   87.50%   +0.03%     
==========================================
  Files         136      136              
  Lines        3272     3272              
==========================================
+ Hits         2862     2863       +1     
+ Misses        410      409       -1     

Impacted Files	Coverage Δ
megalinter/reporters/UpdatedSourcesReporter.py	89.18% <0.00%> (+2.70%)	⬆️

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[nvuillam]

Amazing regex !
And you even corrected some bug I let while migrating to V5, thanks a lot !
Please can you also add a line in CHANGELOG.md ?

[lars-reimann]

@nvuillam I guess an additional changelog entry is not needed anymore, right?

[nvuillam]

@lars-reimann you did such a fine job that i thought I owed you that ;)