pass package type through to resource creation activity item

[ThrawnCA]

Fixes #8034

Proposed fixes:

Pass the package dict through from change_item.html to new_resource.html so we can extract the correct package type if needed.

This is better than a simple fallback to 'dataset' since it lets us preserve custom package types.

However, I'm unsure of the best target branch for this.

Features:

• includes tests covering changes
• includes updated documentation
• includes user-visible changes
• includes API changes
• includes bugfix for possible backport

Please [X] all the boxes above that apply

[ThrawnCA]

The typecheck failure is not coming from this change.

[wardi]

Please make the PR against master, we typically backport to release branches (dev-v2.10 etc.) after merging. The 2.10 and other "bare" version number branches are only used for generating friendly version numbers for our docs

[ThrawnCA]

Please make the PR against master

Done.