Remove 'no-ios' tags from spec tests for limbo resolution throttling

[dconeybe]

Limbo resolution throttling is now implemented in iOS, and, therefore, the spec tests for that feature should be enabled: firebase/firebase-ios-sdk#5310

[changeset-bot]

⚠️ No Changeset found

Latest commit: d71d8a6

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[google-oss-bot]

Binary Size Report

Affected SDKs

No changes between base commit (e55e7c6) and head commit (66f734d).

Test Logs

• Base (e55e7c66): https://github.com/firebase/firebase-js-sdk/actions/runs/267820701
• Head (66f734dd): https://github.com/firebase/firebase-js-sdk/actions/runs/268808083