Improve search experience for API keys page

[SiddharthMantri]

On the API Keys Management page, the search bar is not functioning as intuitively as expected. For example, when attempting to search for an API key by name, the search fails to return results unless the query is wrapped in quotes.

Steps to Reproduce:

• Navigate to the API Keys Management page.
• Create an API key with a name like my api key.
• In the search bar, search for my api key (without quotes).
• Observe that no results are returned.
• Now, try searching for "my api key" (with quotes).
• Observe that the correct API key is returned.

Expected Behavior: The search bar should intuitively return results even if the user does not wrap their search query in quotes.

Actual Behavior: Search queries without quotes fail to find API keys with spaces in their names. This creates unnecessary complexity for users, as they may not be aware that quotes are required.

Screenshots

Without quotes

With quotes

[elasticmachine]

Pinging @elastic/kibana-security (Team:Security)