Fix variable search functionality to maintain state and pagination

[takaro-ci-bot[bot]]

Description

The search functionality for variables needs to be fixed to maintain state and pagination when performing searches. Currently, there are two issues:

1. When searching for variables, the state resets from 'is' and 'contains'.
2. When searching, the pagination limit is being reset.

Requirements/use-cases

• When a user performs a search for variables, the state of 'is' and 'contains' should be maintained.
• The pagination limit should not reset when a user performs a search.
• Users should be able to perform multiple searches without losing their previous search parameters or pagination settings.

Possible duplicates:

• https://github.com/gettakaro/knowledge-base/issues/60

Additional context

This issue was identified during a conversation about the variable search functionality in Takaro. It's important to fix these issues to improve the user experience when searching for variables.

[niekcandaele]

This is probably true for other table searches too?