fix: resolve API alias paths correctly for config files located outside the root folder

[tatomyr]

What/Why/How?

A bunch of fixes for problems I discovered while investigating other issues.

• Fixed an issue where an API alias's root path might be resolved incorrectly for configuration files located outside the root folder.
  E.g., suppose we have this config file: <starting-folder>/nested/redocly.yaml:

apis: 
   alias@v1: 
     root: ./openapi.yaml

When running redocly bundle --config nested/redocly.yaml alias@v1, it would search for <starting-folder>/openapi.yaml instead of <starting-folder>/nested/openapi.yaml.
(See the related snapshot).
The related changes are scoped to packages/cli/src/utils/miscellaneous.ts

• Fixed path output in bundle and lint (most of the snapshots are related to this change)
• Made a small refactoring in the openapi-core: https://github.com/Redocly/redocly-cli/pull/1823/files?diff=split&w=1#diff-32a74d0bc02f339c875f10b6706077b6b16a1838db334faaac75b96c681f700d
• Added an error message when login was unsuccessful:

Reference

Resolves #1351

Testing

Tested internally: https://github.com/Redocly/redocly/pull/12496

Screenshots (optional)

Check yourself

• Code changed? - Tested with redoc/reference-docs/workflows (internal)
• All new/updated code is covered with tests
• New package installed? - Tested in different environments (browser/node)

Security

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

[changeset-bot]

🦋 Changeset detected

Latest commit: 7d2b034

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

This PR includes changesets to release 2 packages

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

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[github-actions]

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
redocly lint packages/core/src/benchmark/benches/rebilly.yaml	989.2 ± 17.9	956.8	1011.0	1.02 ± 0.02
redocly-next lint packages/core/src/benchmark/benches/rebilly.yaml	970.8 ± 13.5	953.1	992.4	1.00

[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟡	Statements	78.62%	5049/6422
🟡	Branches	67.22%	2053/3054
🟡	Functions	73.16%	834/1140
🟡	Lines	78.91%	4762/6035

Show files with reduced coverage 🔻

St.❔	File	Statements	Branches	Functions	Lines
🟡	... / miscellaneous.ts	68.29%	57.85% (-1.98% 🔻)	71.7%	68.05%
🔴	... / login.ts	35.71% (-5.95% 🔻)	0%	0%	35.71% (-5.95% 🔻)

Test suite run success

834 tests passing in 121 suites.

Report generated by 🧪jest coverage report action from 7d2b034