fix: searching edge identities (dashboard_alias prefix and identifier casing)

[matthewelwell]

Changes

This PR fixes 2 issues:

1. Any search term that began with any number of characters contained in the string "dashboard_alias:" would fail because of the way in which lstrip works.
2. When searching by an identifier, the search term was incorrectly lower cased, meaning that the search would return no results if the identifier contained upper case characters (see here for the culprit PR)

tl;dr on (1) - TIL str.lstrip() removes all characters from the beginning of the string that match the input string. What we actually wanted here was str.removeprefix(). More information available here.

How did you test this code?

Added a new unit test with a specific example of the issue.

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
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flagsmith-frontend-staging	⬜️ Ignored (Inspect)	Visit Preview		Oct 8, 2024 10:55am

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-4700	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-4700	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-4700	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-4700	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4700	Finished ✅	Results ✅

[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.21%. Comparing base (e65c8da) to head (f003cd8).
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4700   +/-   ##
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  Coverage   97.20%   97.21%           
=======================================
  Files        1171     1171           
  Lines       40640    40651   +11     
=======================================
+ Hits        39506    39517   +11     
  Misses       1134     1134           

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