feat: Add issue_lock.yml file, remove redundant fields from the workflows

[kurosakishigure]

Description

• Add issue_lock.yml file
• Removed the redundant Checkout repository step from labeler.yml
• Removed the redundant github-token field from the labeler.yml file
• Removed the redundant gitHub-token field from the ci.yml file
• Rename path-to-lcov to file from the ci.yml file
• Rename coverallsapp/github-action@master to coverallsapp/github-action@v2 from the ci.yml file
• Removed the redundant env.GITHUB_TOKEN field from the cd.yml file
• Rename Add Labels to Add labels from the labeler.yml file
• What is the purpose of this PR?
  • Closed Add an issue_lock.yml file #148
• What problem does it solve?
  • See Add an issue_lock.yml file #148
• Are there any breaking changes or backwards compatibility issues?
  • None

Related Issue

• Closes Add an issue_lock.yml file #148

Type of Change

• New feature
• Miscellaneous tasks

How Has This Been Tested?

• I have run unit tests
• I have tested the changes manually
• I have tested in a staging environment

Checklist

• I have read and followed the guidelines in CONTRIBUTING.md
• I have already updated the related templates accordingly (if applicable)
• I have written or updated relevant documentation (if applicable)
• I have added or updated tests to cover my changes (if applicable)
• I have reviewed my code for any potential issues

Additional Notes

None.

[kurosakishigure]

This PR is worth monitoring, but there shouldn't be any major issues. ¯ \ _ (°ペ) _ / ¯