Add test cases for filters service

[Arif-Khalid]

Summary:

Fixes part of #295

Type of change:

• 🧪 Tests Update

Changes Made:

• Added test cases for filters service
  • Covered initial behaviour
  • Covered clear filters
  • Covered update filters
  • Covered update preset view
• In order to reduce the size of the PR, other functionality will be tested for in another PR

Proposed Commit Message:

Filters service does not have associated tests.

Tests for filters service would make the project
more stable.

Let's add test cases for the filters service.

Checklist:

• I have tested my changes thoroughly.
• I have created tests for any new code files created in this PR or provided a link to a issue/PR that addresses this.
• I have added or modified code comments to improve code readability where necessary.
• I have updated the project's documentation as necessary.

[Arif-Khalid]

To be worked on after finalization of #310 as it makes significant changes to filters service.

[nknguyenhc]

What's the reasoning for adding this line? Isn't this already covered under the call to updatePresetView?

[Arif-Khalid]

After the most recent change to filters service, the preset view does not contain all filters anymore. Specifically in the current implementation, it excludes hiddenLabels. This ensures that the hidden labels filter and any future filter that is not bound to preset views are properly reset.

[NereusWB922]

LGTM!