chore: move remove-unused-components decorator to decorators folder

[tatomyr]

What/Why/How?

Moving the remove-unused-components decorator from rules to decorators folder. No functional changes.

Reference

Testing

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Check yourself

• Code is linted
• Tested with redoc/reference-docs/workflows (internal)
• All new/updated code is covered with tests

Security

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

[changeset-bot]

⚠️ No Changeset found

Latest commit: 6031651

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[github-actions]

Command	Mean [s]	Min [s]	Max [s]	Relative
redocly lint packages/core/src/benchmark/benches/rebilly.yaml	1.321 ± 0.025	1.271	1.348	1.00 ± 0.03
redocly-next lint packages/core/src/benchmark/benches/rebilly.yaml	1.320 ± 0.028	1.295	1.395	1.00

[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟡	Statements	76.12%	4057/5330
🟡	Branches	65.95%	2152/3263
🟡	Functions	68.3%	657/962
🟡	Lines	76.31%	3805/4986

Show new covered files 🐣

St.❔	File	Statements	Branches	Functions	Lines
🟢	... / remove-unused-components.ts	83.87%	84.62%	66.67%	86.21%
🟢	... / remove-unused-components.ts	93.94%	86.67%	100%	96.77%

Test suite run success

646 tests passing in 93 suites.

Report generated by 🧪jest coverage report action from 6031651