Converts FindBar into redux component

[NejcZdovc]

Submitter Checklist:

• Submitted a ticket for my issue if one did not already exist.
• Used Github auto-closing keywords in the commit message.
• Added/updated tests for this change (for new code or code which already has tests).
• Ran git rebase -i to squash commits (if needed).
• Tagged reviewers and labelled the pull request as needed.

Resolves #9338
Resolves #8877

Auditors: @bsclifton @bridiver

Test Plan:

• find bar should open when you press cmd+f
• check if find is working
• check if result number is correct
• check if find bar input is cleared when you open(put a in)/close/open in a private tab

Reviewer Checklist:

Tests

• Adequate test coverage exists to prevent regressions
• Tests should be independent and work correctly when run individually or as a suite ref
• New files have MPL2 license header