[web] Add "Search in file content" filter Chip

[exalate-issue-sync]

Description

User Stories

• As a user I want enable fulltext search via UI, so that I don't need to learn the syntax.

• As a user I want a ui for the fulltext search so that I know that this feature is available.

Value

Acceptance Criteria

• add filterchip "Search in file content" to search result page
• Filterchip toggles the option
• if on, status is reflected via ✓ checkmark
• if on, status can be disabled via X cross
• filterchip status is reflected in the URL (as its own query param)

Definition of ready

[ ] everybody needs to understand the value written in the user story
[ ] acceptance criteria has to be defined
[ ] all dependencies of the user story need to be identified
[ ] feature should be seen from an end user perspective
[ ] user story has to be estimated
[ ] story points need to be less then 20

Definition of done

• Functional requirements
  [ ] functionality described in the user story works
  [ ] acceptance criteria are fulfilled
• Quality
  [ ] code review happened
  [ ] CI is green
  [ ] critical code received unit tests by the developer
  [ ] automated tests passed (if automated tests are not available, this test needs to be created and passed
• Non-functional requirements
  [ ] no sonar cloud issues