[im3dabasia]

Adds the Ipsum default theme to the performance tests.

• Bumps the baseline version from 7.0.0 to 7.2.0, the first release with Ipsum.
• Adds Ipsum to the tested themes and enables it on multisite.
• Maps the Ipsum homepage results for the Code Vitals dashboard.

Do not commit until 7.2 is released. The 7.2.0 tag doesn't exist yet, so baseline runs on trunk would fail until then.

Trac ticket: https://core.trac.wordpress.org/ticket/66361

Use of AI Tools

AI assistance: Yes
Tool(s): Claude Code
Model(s): Claude Opus 5.5, Claude Fable 5.1
Used for: Drafting the patch and PR description. I reviewed all changes.

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