Encode suite name

What does this MR do?

Related to #231347 (closed)

Some suite names have a / included (e.g. rspec/8), which breaks the endpoint path. We need to encode the suite name in order for it to work properly.

This change is behind a feature flag and does not need a changelog.

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Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
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• [-] Separation of EE specific content

Availability 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
• [-] Informed Infrastructure department of a default or new setting change, if applicable per definition of done