test(boards2): add missing filetests for member invite

[jeronimoalbi]

Add missing filetests for InviteMember() function.

Related to #3623

This covers all tests for the function:

• Invite to realm success
• Fail when admin invites a new realm owner
• Success when admin invites a new realm admin
• Fail w/ invalid invite role
• Invite to board success
• Fail w/ existing user
• Fail for non member (unauthorized)

[Gno2D2]

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[jeronimoalbi]

@x1unix this PR is ready for review 🙏

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