ci: add GitHub repo stats action

[sudiptob2]

Description

Added github-repo-stats.yml workflow to generate traffic statistics statistic snapshots each day and save it to the github-repo-stats branch.

Fixes #2628

Checklist

• My PR fulfills the Definition of Done of the corresponding issue and not more (or parts if the issue is separated
  into multiple PRs)
• I used descriptive commit messages to help reviewers understand my thought process
• I signed off all my commits according to the Developer Certificate of Origin (DCO)
  see Contribution Guide
• My PR title is formatted according to the semantic PR conventions described in
  the Contribution Guide
• My code follows the style guidelines of this project (golangci-lint passes, YAMLLint passes)
• I regenerated the auto-generated docs for Helm and the CRD documentation (if applicable)
• I have performed a self-review of my code
• I have made corresponding changes to the documentation (if needed)
• My changes result in all-green PR checks (first-time contributors need to ask a maintainer to approve their test runs)
• New and existing unit and integration tests pass locally with my changes

[netlify]

✅ Deploy Preview for keptn-lifecycle-toolkit ready!

Name	Link
🔨 Latest commit	ed1175d
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[codecov]

Codecov Report

Merging #2647 (612b60c) into main (32be4db) will not change coverage.
Report is 6 commits behind head on main.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2647   +/-   ##
=======================================
  Coverage   85.48%   85.48%           
=======================================
  Files         155      155           
  Lines       10175    10175           
=======================================
  Hits         8698     8698           
  Misses       1198     1198           
  Partials      279      279           

Flag	Coverage Δ
certificate-operator	67.43% <ø> (ø)
component-tests	56.36% <ø> (ø)
lifecycle-operator	84.44% <ø> (ø)
metrics-operator	87.43% <ø> (ø)
scheduler	36.53% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

[mowies]

LGTM overall, just some minor adjustments :)

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[mowies]

LGTM! Thanks for your contribution 🎉