fix: improve detection accuracy on no-server-example.com rule

[adamaltman]

What/Why/How?

Improves the detection accuracy for the no-server-example.com rule.

Reference

Closes #1269

Testing

Added tests and had to adjust multiple tests which used variants of example.com.

Screenshots (optional)

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]

🦋 Changeset detected

Latest commit: f994214

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

This PR includes changesets to release 2 packages

Name	Type
@redocly/openapi-core	Patch
@redocly/cli	Patch

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[github-actions]

Command	Mean [s]	Min [s]	Max [s]	Relative
redocly lint packages/core/src/benchmark/benches/rebilly.yaml	1.595 ± 0.044	1.517	1.684	1.00
redocly-next lint packages/core/src/benchmark/benches/rebilly.yaml	1.611 ± 0.052	1.541	1.687	1.01 ± 0.04

[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟡	Statements	75.9%	3999/5269
🟡	Branches	65.82%	2130/3236
🟡	Functions	67.92%	648/954
🟡	Lines	76.09%	3748/4926

Test suite run success

636 tests passing in 93 suites.

Report generated by 🧪jest coverage report action from f994214