mgr/dashboard: allow Origin url for CORS if present in config

[avanthakkar]

By default the browser will not set Access-Control-Allow-Origin header in Request headers. So allow the CORS for the origins which uses browser to access the url and are mentioned in config key cross_origin_url.

Fixes: https://tracker.ceph.com/issues/58245
Signed-off-by: Avan Thakkar athakkar@redhat.com

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e2e failures aren't related to the PR. Proceeding with merging PR.