Remove `type` from infrastructure blocks

[desertaxle]

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• [X] I added a descriptive title to this issue.
• [X] I used the GitHub search to find a similar request and didn't find it.
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Prefect Version

2.x

Describe the proposed behavior

The type field on infrastructure blocks is removed and the block type slug is used in it's place.

Describe the current behavior

The type field on infrastructure blocks is unnecessary with the addition of block type slugs. The type currently matches the block type slug (e.g. docker-container for the DockerContainer block) and the block type slug can be used instead to remove an unnecessary field from the block document creation form for those block types.

Example Use

No response

Additional context

No response

[github-actions[bot]]

This issue is stale because it has been open 30 days with no activity. To keep this issue open remove stale label or comment.

[desertaxle]

Infrastructure blocks have been removed in the 3.0 RC and will be removed in 2.x once the deprecation period is.