Refactor school search

[stusherwin]

Description

This PR does the following:

• Refactors search page from separate Index and Search actions to a single Index action
• Search landing page route remains as /find-a-school
• Search results route changes from /find-a-school/search?query=XXX&page=1 to /find-a-school?query=XXX&page=1

Related Trello Ticket

https://trello.com/c/GHPzXyKg/316-search-page-issues

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Refactor

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Unit tests added/updated
• Integration tests added/updated
• Manual testing performed
• Tested on Local/Review

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have verified accessibility requirements are met

[github-actions]

Deployments

Review app is available at these URLs:
https://get-school-improvement-insights-pr-259.test.teacherservices.cloud

[github-actions]

Code Coverage Report: Only Changed Files listed

Package	Coverage
Overall Coverage	🟢 69.81%

Minimum allowed coverage is 0%, this run produced 69.81%