docs: Adds how to report coverage on test failures

[davelosert]

This pull requests improves the quality of the documentation by rewording and restructuring in several places.

Also fixes #307

[github-actions]

Coverage Report for Mock Reports (./test/mockReports)

Status	Category	Percentage	Covered / Total
🔵	Lines	41.37%	60 / 145
🔵	Statements	41.33%	62 / 150
🔵	Functions	62.06%	18 / 29
🔵	Branches	39.65%	23 / 58

File Coverage

No changed files found.

Generated in workflow #617

[github-actions]

Coverage Report for Root

Status	Category	Percentage	Covered / Total
🔵	Lines	52.58%	387 / 736
🔵	Statements	52.58%	387 / 736
🔵	Functions	73.68%	14 / 19
🔵	Branches	90%	63 / 70

File Coverage

File	Stmts	% Branch	% Funcs	% Lines	Uncovered Lines
Unchanged Files
src/FileCoverageMode.ts	100%	100%	100%	100%
src/generateFileCoverageHtml.ts	100%	100%	100%	100%
src/generateFileUrl.ts	94.44%	50%	100%	94.44%	6
src/generateHeadline.ts	100%	100%	100%	100%
src/generateSummaryTableHtml.ts	100%	100%	100%	100%
src/getPullChanges.ts	0%	0%	0%	0%	1-58
src/getUncoveredLinesFromStatements.ts	100%	100%	100%	100%
src/getViteConfigPath.ts	98.03%	87.5%	100%	98.03%	39
src/icons.ts	100%	100%	100%	100%
src/index.ts	0%	0%	0%	0%	1-80
src/options.ts	0%	0%	0%	0%	1-35
src/parseCoverageThresholds.ts	100%	100%	100%	100%
src/parseJsonReports.ts	0%	0%	0%	0%	1-50
src/writeSummaryToPR.ts	0%	0%	0%	0%	1-124

Generated in workflow #617

[github-actions]

🎉 This PR is included in version 2.2.0 🎉

The release is available on:

• GitHub release
• v2.2.0

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