Support dark mode for Mermaid diagrams

[JumiDeluxe]

Description

Added switching theme of diagrams on theme change, and by that added support for dark mode diagrams.
This is based on google/docsy#1964.
A lot of diagrams are not well adjusted to switching themes due to a lot of hardcoded colors in diagrams. I will adjust them in next PR.

Issue

Closes: #56331

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[JumiDeluxe]

/assign @shannonxtreme

[JumiDeluxe]

/assign @lmktfy

[lmktfy]

/uncc

I'm happy for other folks to review this.