Add headers for all tabular data

From usability testing of the manage users table, we found that users expected to have headers for subsequent tables they saw after seeing the users table. We should be consistent in our use of table headers.

Note: Not every table needs to be sortable.

Screens

Example of a table with headers:

Example of a table without headers (edit access permissions/space roles):

Ensure this issue has a clear Definition of Done in the Acceptance Criteria list below:

Acceptance Criteria

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