[AI-680] Allow contains operator ~ for space and space.key fields in the Search REST API to allow partial match

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Allow partial match when searching for spaces using space or space.key fields

Otherwise, we need to fetch all spaces from the paginated REST API and filter them in the frontend code.

E.g. a request with a query of "ex" would return a list of spaces like

...
{"key": "external", "name": "external content"}, 
{"key":"example", "name":"example space"}, 
{"key":"xyz", "name":"extra space"}
...

Although using contains operator with the space field is not supported based on the documentation, for some instances it does work.

/wiki/rest/api/search?cql=space ~ "ex*" AND type = space

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