Fix/676 gf file upload issue

[ravewebdev]

Closes #676

Description

• Addresses bug in wds-headless-blocks causing block rendering to break. Splits hex color handling into separate filters for attrs and edit override.
• Bumps requirement for WP GraphQL Gravity Forms to ^0.6. Note: 0.7.0 introduces breaking changes, which we will need to integrate separately at a later date due to the complexity involved.
• Re-applies changes from Fixing 500 error on GF Form Submission #606 that were lost in the switch to canary.

Screenshot

Verification

1. gh pr checkout 676
2. Ensure local WP install is running WP GraphQL Gravity Forms 0.6.x
3. npm run build && npm run start
4. http://localhost:3000/contact
5. submit form with an image upload

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[justlevine]

@ravewebdev wasn't entirely sure where to leave this, but I'd hold off a few weeks before migrating to v0.7+

The next release is a major rewrite of the plugin but we expect it to be the last major breaking change on the path to v1.0 (e.g. not bugfixing an Int to a Float, or replacing a string with an enum.)

With it should come a significantly simpler way to handle custom fields, better query syntaxes, and more robust/performant ways to query/mutate/paginate and otherwise handle data.

[ravewebdev]

@justlevine do you have an estimated release date for this next release?

[justlevine]

@ravewebdev at the current pace, I'd say ~3 weeks.

[justlevine]

@ravewebdev https://github.com/harness-software/wp-graphql-gravity-forms/tree/v0.10.0

There's tons of breaking changes, but there shouldnt be any more major breaks before v1.0. Feel free to hmu on the WPGraphQL slack if you need any help with the migration.