refactor(tests): Use codeBlock tagged literal

[zharinov]

Changes

• Nice indenting of code fragments used in tests
• Indenting level infromation doesn't leak to the code fragment
• Describing code blocks near the place where it's being used is safer

Context

Documentation (please check one with an [x])

• I have updated the documentation, or
• No documentation update is required

How I've tested my work (please tick one)

I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
• No unit tests but ran on a real repository, or
• Both unit tests + ran on a real repository

[viceice]

it seems we've some test issues¹ in mint manager

Footnotes

1. https://app.codecov.io/gh/renovatebot/renovate/pull/18916 ↩

[renovate-release]

🎉 This PR is included in version 34.25.0 🎉

The release is available on:

• GitHub release
• 34.25.0

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