Add frozen_string_literal to spec/lib (part 1)

What does this MR do?

Add frozen_string_literal to half of the offending files in spec/lib (Part 1: 394/798 files)

Will do the other 400 files in another MR

https://gitlab.com/gitlab-org/gitlab-ce/issues/59758

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry for user-facing changes, or community contribution. Check the link for other scenarios.
• Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Performance and testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team

changed milestone to %Backlog

added [deprecated] Accepting merge requests backend backstage [DEPRECATED] test labels

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	1 Warning
⚠	This merge request is quite big (more than 826 lines changed), please consider splitting it into multiple merge requests.

Reviewer roulette

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Category	Reviewer	Maintainer
backend	Ross Fuhrman (@rossfuhrman)	Stan Hu (@stanhu)

Generated by 🚫 Danger

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• 01ab423e - Add frozen_string_literal to spec/lib

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Can you please review @rossfuhrman ? Might be faster to git show locally

assigned to @rossfuhrman and unassigned @tkuah

Looks like there's some failures, will take this back

assigned to @tkuah and unassigned @rossfuhrman

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• 42467956 - Add frozen_string_literal to spec/lib (part 1)

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• 87286e3f - Fix cannot modify frozen string
• cbd7db21 - Frozen string cannot change encoding

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• 7bb15864 - Add frozen_string_literal to spec/lib (part 1)
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• d48e63b0 - Frozen string cannot change encoding
• d9741286 - Fix can't modify frozen String

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