test(boards2): add missing filetests for board rename

[jeronimoalbi]

Add a missing filetests for RenameBoard() function.

Related to #3623.

This covers all tests for the function:

• Rename success by default board owner
• Fail w/ empty board name
• Fail w/ existing board name
• Fail when renaming unexisting board
• Fail w/ an address as board name
• Rename success by another board owner
• Fail because name is registered and not owned in users realm
• Fail w/ short name
• Rename success with owned name registered in users realm
• Fail for non board DAO member

[Gno2D2]

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[jeronimoalbi]

@x1unix this PR is ready for review 🙏