Encode action result in cookie

[matthewp]

Changes

• base64 encode the action result that is saved within the cookie in the redirect flow.
• Additionally this trims down the input errors to only the used fields, otherwise it's very easy for it to be too large.
• Fixes Astro Actions - Cookie Too large #11973

Testing

• Test added with a large form, 10 fields, all having validation errors.

Docs

N/A, bug fix

[changeset-bot]

🦋 Changeset detected

Latest commit: a9d2610

The changes in this PR will be included in the next version bump.

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[bholmesdev]

Interesting that we need to parse out issues and fields manually here. What was it passing before?

[matthewp]

The entire error object which includes the stack and the message both of which can be quite long, and including either results in this test being too large.

[bholmesdev]

This should result in fewer errors!