Execute scripts on page navigation (view transitions)

[matthewp]

Changes

• DOMParser creates scripts that are non executable, event after inserting into the page.
• This makes it so that scripts are always executed. If they have already run we reinsert them. That means for inline classic scripts those will re-run. Module scripts will not.
• This approach was chosen mostly because it's the last amount of code. It also aligns with what Swup does it.
• Adds the astro:load even that you can listen to if you need to rerun something on page navigation.
• Fixes View Transition resets html attributes #7765

Testing

• Test added to verify the astro:load event fire on forward navigation.
• Test added to verify astro:load fires on direct page navigation (MPA).

Docs

• Document caveats with using ViewTransitions component docs#3810

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Latest commit: 0d0dbde

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[sarah11918]

Quick comment on the changeset text, @matthewp, and just a quick question whether we should be adding astro:load as part of the docs PR (since I don't think there's anything existing there) that I'll also bring up there!

[sarah11918]

Approved by docs!

[doganalper]

I think this would solve problem I'm facing currently. I wanted to add view transitions but since I have dark/light theme it breaks logic I have and themes not working properly. Good work @matthewp!