chore: rename UserActionSeverity to UserActionImportance

[eskirk]

"importance" fits our internal representation of user actions better than "severity" - so I am deprecating the "severity" parameter in favor of "importance".

[github-actions]

😢 zizmor failed with exit code 14.

Expand for full output

error[cache-poisoning]: runtime artifacts potentially vulnerable to a cache poisoning attack
  --> ./.github/workflows/release.yml:22:9
   |
 3 | / on:
 4 | |   push:
 5 | |     tags:
 6 | |       - '*'
   | |___________- generally used when publishing artifacts generated at runtime
...
22 |           uses: actions/setup-node@v5
   |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^ cache enabled by default here
   |
   = note: audit confidence → Low

error[cache-poisoning]: runtime artifacts potentially vulnerable to a cache poisoning attack
  --> ./.github/workflows/release.yml:72:9
   |
 3 | / on:
 4 | |   push:
 5 | |     tags:
 6 | |       - '*'
   | |___________- generally used when publishing artifacts generated at runtime
...
72 | /         with:
73 | |           node-version: 'lts/*'
74 | |           cache: 'none'
   | |_______________________^ opt-in for caching here
   |
   = note: audit confidence → Low

error[cache-poisoning]: runtime artifacts potentially vulnerable to a cache poisoning attack
   --> ./.github/workflows/release.yml:111:9
    |
  3 | / on:
  4 | |   push:
  5 | |     tags:
  6 | |       - '*'
    | |___________- generally used when publishing artifacts generated at runtime
...
111 |           uses: actions/setup-node@v5
    |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^ cache enabled by default here
    |
    = note: audit confidence → Low

19 findings (16 suppressed): 0 informational, 0 low, 0 medium, 3 high

[codecapitano]

LGTM

@eskirk can we change a UserActionImportance enum to a constant.
E. g. like const userActionImportance: 'critical' | 'normal'?

This makes it much easier to use then forcing users to always use the enum.
Atm you cant't do something like the below without getting linter errors because you can't compare string value with enum.

startUserAction('foo', undefined, { severity: 'critical' });