Pm search for packages - search box control

[dnenov]

Purpose

Small changes to the new search box control fixing the expected behavior to disable the search box while packages are being loaded. Also contains small UI changes as per the design outline in Figma.

UI Changes

Declarations

Check these if you believe they are true

• The codebase is in a better state after this PR
• Is documented according to the standards
• The level of testing this PR includes is appropriate
• User facing strings, if any, are extracted into *.resx files
• All tests pass using the self-service CI.
• Snapshot of UI changes, if any.
• Changes to the API follow Semantic Versioning and are documented in the API Changes document.
• This PR modifies some build requirements and the readme is updated
• This PR contains no files larger than 50 MB

Release Notes

• fixed the expected behavior for the search box to be disabled while the packages are being loaded
• UI changes as per Figma

Reviewers

@QilongTang
@Jingyi-Wen

FYIs

@Amoursol