Update solution query key to match text

What does this MR do and why?

With the text change in this MR > !136778 (merged), this MR make the updates to the Query Key to match 👍

- Is available
- Is not available
+ Has a solution
+ Does not have a solutiion

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. Have the related FF enabled: echo "Feature.enable(:activity_filter_has_remediations)" | rails c
2. In order to run a pipeline to generate a Vulnerability report, you'll need an EE license.
3. Fork https://gitlab.com/gitlab-org/govern/demos/sandbox/minac/test-remediations.
4. Run a pipeline against the default branch. It will generate vulnerabilities.
5. Go to the project vulnerability report page
6. Select a solution in the "Activity" filter, the query key should match the text

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #431728 (closed)