Add bundle size reports to the PR description

[Leah-Xia-Microsoft]

What

• Add/update the bundle size reports to the bottom of the PR description
• Remove the bundle size comments
• Block PR if the bundle size change is greater than the significant threshold and no tag is added

Why

How Tested

• After adding a testing commit to increase the bundle size, the chat bundle size has been updated in the description.
  

• And the CI job fails with the correct error message
  

• After adding the significant bundle size change label, the bundleSizeCheck step is ignored and the CI job passes
  

Process & policy checklist

• I have updated the project documentation to reflect my changes if necessary.
• I have read the CONTRIBUTING documentation.

Is this a breaking change?

• This change causes current functionality to break.

Calling bundle size is not changed.

• Current size: 8139366
• Base size: 8139366
• Diff size: 0

CallWithChat bundle size is not changed.

• Current size: 8139379
• Base size: 8139379
• Diff size: 0

Chat bundle size is decreased✅.

• Current size: 1757266
• Base size: 1757267
• Diff size: -1

[github-actions]

@azure/communication-react jest test coverage for stable.

	Lines	Statements	Functions	Branches
Base	26875 / 43178 62.24%	26875 / 43178 62.24%	733 / 1340 54.7%	2127 / 3416 62.26%
Current	26815 / 43178 62.1%	26815 / 43178 62.1%	733 / 1340 54.7%	2143 / 3416 62.73%
Diff	-60 / 0 -0.14%	-60 / 0 -0.14%	0 / 0 0%	16 / 0 0.47%

[github-actions]

@azure/communication-react jest test coverage for beta.

	Lines	Statements	Functions	Branches
Base	53787 / 88010 61.11%	53787 / 88010 61.11%	1093 / 2486 43.96%	3207 / 5311 60.38%
Current	53830 / 88010 61.16%	53830 / 88010 61.16%	1093 / 2486 43.96%	3210 / 5316 60.38%
Diff	43 / 0 0.05%	43 / 0 0.05%	0 / 0 0%	3 / 5 0%