🚧Add sync ignore branches feature

[CalvinWilkinson]

I have done the items below . . .

• I have updated the title without removing the 🚧 emoji.

Description

Add a feature to the SyncPRToIssue process where pull requests with a head branch can be ignored if they exist in an ignore list. This ignore list should be a comma delimited list of values from an ORG or REPO variable.

The name of the ORG/REPO variable should be PR_SYNC_BRANCH_BLACK_LIST.
Any branch names in this list will be ignored if the pull request has a head branch that matches any of the branch names.

Acceptance Criteria

This issue is finished when:

• PR_SYNC_BRANCH_BLACK_LIST org variable added
• SyncPRToIssueRunner updated to skip syncing if the head branch matches any branches in the black list.
  • Notice printed to GitHub console if skipped due to a black-list match.

ToDo Items

• Priority label added to this issue. Refer to the Priority Type Labels section below.
• Change type labels added to this issue. Refer to the Change Type Labels section below.
• Issue linked to the correct project.

Issue Dependencies

No response

Related Work

No response

Additional Information:

Change Type Labels

Change Type	Label
Bug Fixes	🐛bug
Breaking Changes	🧨breaking changes
Enhancement	enhancement
Workflow Changes	workflow
Code Doc Changes	🗒️documentation code
Product Doc Changes	📝documentation product

Priority Type Labels

Priority Type	Label
Low Priority	low priority
Medium Priority	medium priority
High Priority	high priority

Code of Conduct

• I agree to follow this project's Code of Conduct.