[QA] Add API test coverage for listing (searching) other users by a normal user

[saw-jan]

Description

Regular users can search for other users and groups. The following limitations
apply:

• Only search queries are allowed (using the ?$search=<term> query parameter)
• The search term needs to have at least 3 characters
• For user searches the result set only contains the attributes displayName, mail, userType and id
• For group searches the result set only contains the attributes displayName, groupType and id
• Disabled users should not be listed (SharingNg. sharing invitation  #7962 (comment))

Endpoint:

GET /graph/v1.0/(users|groups)?$search=<search-term>

User : Test cases (search by):

• displayname [tests-only][full-ci] Added API tests for searching users by normal user using display name #8094
• less than 3 characters [tests-only][full-ci] Added API tests for searching users by normal user using display name #8094
• OData special characters (@ and -) [tests-only][full-ci] Added API tests for searching users by normal user using display name #8094
• try to search disabled user [tests-only][full-ci] Added API tests for searching users by normal user #8241
• user mail [tests-only][full-ci] Added API tests for searching users by normal user #8241
• multiple users having same displayname [tests-only][full-ci] Added API tests for searching users by normal user #8241

Group : Test cases (search by):

• displayname [tests-only][full-ci] Added tests for searching groups by a normal user #8096
• less than 3 characters [tests-only][full-ci] Added tests for searching groups by a normal user #8096
• OData special characters (@ and -) [tests-only][full-ci] Added tests for searching groups by a normal user #8096

Related issues:

• can't list users as a normal user (graph api) #7782
• Search user/group by with OData special charcters in search term ( e.g. @ or -) doesn't work  #7990

Port PRs

• forward port : [tests-only][full-ci] forward port user and group search tests #8240