chore: do not update domain env variable from code

[IgorKarpiuk]

What/Why/How?

Do not update REDOCLY-DOMAIN env variable from code, use static variable instead

Reference

Testing

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Has code been changed?

• 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: e1249c2

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[github-actions]

Command	Mean [s]	Min [s]	Max [s]	Relative
redocly lint packages/core/src/benchmark/benches/rebilly.yaml	1.117 ± 0.020	1.085	1.165	1.00 ± 0.03
redocly-next lint packages/core/src/benchmark/benches/rebilly.yaml	1.114 ± 0.023	1.086	1.155	1.00

[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟡	Statements	76.1%	4304/5656
🟡	Branches	65.85%	2246/3411
🟡	Functions	68.81%	695/1010
🟡	Lines	76.31%	4048/5305

Show files with reduced coverage 🔻

St.❔	File	Statements	Branches	Functions	Lines
🟡	... / index.ts	65.71%	71.43%	75%	65.71%

Test suite run success

699 tests passing in 100 suites.

Report generated by 🧪jest coverage report action from e1249c2

[IgorKarpiuk]

Should be fixed in #1433