feat: add support for checkstyle format for scorecard-classic command

[AlbinaBlazhko17]

What/Why/How?

Implemented checkstyle format for scorecard-classic command.

Reference

Resolves #2581

Testing

Locally

Screenshots (optional)

Check yourself

• Code changed? - Tested with Redoc/Realm/Reunite (internal)
• All new/updated code is covered by tests
• New package installed? - Tested in different environments (browser/node)
• Documentation update considered

Security

• The security impact of the change has been considered
• Code follows company security practices and guidelines

[changeset-bot]

🦋 Changeset detected

Latest commit: 375815e

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
@redocly/cli	Minor
@redocly/openapi-core	Minor
@redocly/respect-core	Minor

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	79.29% (🎯 79%)	6461 / 8148
🔵	Statements	78.75% (🎯 78%)	6680 / 8482
🔵	Functions	82.52% (🎯 82%)	1318 / 1597
🔵	Branches	71.24% (🎯 71%)	4411 / 6191

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
packages/cli/src/commands/scorecard-classic/index.ts	0%	0%	0%	0%	23-137
packages/cli/src/commands/scorecard-classic/formatters/checkstyle-formatter.ts	100%	100%	100%	100%
packages/core/src/format/format.ts	50.8%	41.5%	58.06%	50.56%	25, 67-68, 113, 117-143, 161, 165, 173-191, 200-305, 310, 323-329, 354-360, 367, 412-425, 439-440, 467

Generated in workflow #8994 for commit 375815e by the Vitest Coverage Report Action

[github-actions]

CLI Version	Mean Time ± Std Dev (s)	Relative Performance (Lower is Faster)
cli-latest	3.531s ± 0.039s	▓ 1.00x (Fastest)
cli-next	3.535s ± 0.019s	▓ 1.00x

[tatomyr]

Suggested change

	source: createMockSource('/api/openapi.yaml') as any,
	source: { absoluteRef: '/api/openapi.yaml') } as any,

You can simply use this, I believe. No need for the factory function. (Same in other scorecard tests.)

[AlbinaBlazhko17]

The createMockSource function is used to mock the functions, which are used inside printScorecardResultsAsCheckstyle. If i change it just to absoluteRef i will receive an error: TypeError: source.getAst is not a function.

[tatomyr]

Got it. Makes sense.