fix(ui): amend label filter after filter change

[yuri1969]

What changes are being made and why?

Prevent the value of labels filter from being explicitly URI-encoded.

The issue might be related to #7404.

Steps to reproduce the issue

1. Create the attached flow
2. Execute the flow at least once
3. Navigate to the Executions view
4. Add the namespace is company.team filter
   Either:
5. Click on the amp&:amp& label on the executions table
6. Remove the namespace is company.team filter
   Or:
7. Add the labels is amp&:amp& filter manually

The flow execution(s) gets filtered out completely. This is caused by the filter query getting URI-encoded to amp%2526 instead of amp%26.

---

How the changes have been QAed?

id: rat_157618
namespace: company.team

labels:
  amp&: amp& # '&' should be handled correctly

tasks:
  - id: hello
    type: io.kestra.plugin.core.log.Log
    message: Hello World! 🚀