What does this PR do?

If a user's search contains # in the query, encode it to %23 before replacing the window.location for the search result page.

Motivation

https://datadoghq.atlassian.net/browse/WEB-1698

Preview

Search for C# or F#
https://docs-staging.datadoghq.com/davidweid/encode-hash-url/

Additional Notes

• When searching a term with the "#" character, such as "F#" or "C#", search results shown as suggestions should include the "#". When the search is declared with the "Enter" key or by hitting the search button/icon, the page should redirect to the search results with a URL that has encoded "#" to "%23" and the results should match for "#".

Reviewer checklist

• Review the changed files.
• Review the URLs listed in the Preview section.