keycloak: URL-encode query parameters for usernames with special characters (#11472)
* fix(keycloak): URL-encode query params for usernames with special chars
get_user_by_username() concatenates the username directly into the URL
query string. When the username contains a +, it is interpreted as a
space by the server, returning no match and causing a TypeError.
Use urllib.parse.quote() (already imported) for the username parameter.
Also replace three fragile .replace(' ', '%20') calls in the authz
search methods with proper quote() calls.
Fixes#10305
* Update changelogs/fragments/keycloak-url-encode-query-params.yml
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(cherry picked from commit c41de53dbb)
Co-authored-by: Ivan Kokalovic <67540157+koke1997@users.noreply.github.com>
Co-authored-by: Alexei Znamensky <103110+russoz@users.noreply.github.com>
