Fix race condition when setting up session verification controller subscriptions

[stefanceriu]

We were running the SessionVerificationController in a task after updating the session verification state, which would result in trying to subscribe to a nil object.

[github-actions]

	Warnings
⚠️	Some of the commits are missing ticket numbers. Please consider squashing all commits that don't have a tracking number.

Generated by 🚫 Danger Swift against 773f985

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[pixlwave]

LGTM 🤞

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
848	1	847	0

View the full list of 1 ❄️ flaky tests

PreviewTests test_userProfileScreen()

Flake rate in main: 20.00% (Passed 32 times, Failed 8 times)

Stack Traces | 8.45s run time

failed - Snapshot "Verified User" does not match reference.

@−
"file:.../__Snapshots__/PreviewTests/test_userProfileScreen-iPhone-16-en-GB.Verified-User.png"
@+
"file:.../tmp/PreviewTests/test_userProfileScreen-iPhone-16-en-GB.Verified-User.png"

To configure output for a custom diff tool, use 'withSnapshotTesting'. For example:

    withSnapshotTesting(diffTool: .ksdiff) {
      // ...
    }

The percentage of pixels that match 0.9031372 is less than required 1.0
The lowest perceptual color precision 0.31062502 is less than required 0.98 (.../PreviewTests/Sources/PreviewTests.swift:84)

To view individual test run time comparison to the main branch, go to the Test Analytics Dashboard