Ensure blocklist is updated always

[aitorvs]

Task/Issue URL: https://app.asana.com/1/137249556945/project/1202279501986195/task/1210112806879953?focus=true

Description

Remove the eTag checks to ensure blocklist is always stored

Steps to test this PR

Test 1

• build and install internal debug build
• launch the app
• verify Updating the app tracker blocklist, previous/new eTag:... appears in logs

Test 2

• Change from ExistingPeriodicWorkPolicy.KEEP to ExistingPeriodicWorkPolicy.REPLACE in AppTrackerListUpdateWorkerScheduler
• build and install internal debug build
• launch the app
• verify Updating the app tracker blocklist, previous/new eTag:... appears in logs
• force close and reopen the app
• verify Updating the app tracker blocklist, previous/new eTag:... appears in logs

[aitorvs]

• Ensure blocklist is updated always #5989 👈 (View in Graphite)
• develop

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[laghee]

@aitorvs I don't get a second update if I force close and re-launch in Test 2 with REPLACE instead of KEEP. Am I missing a step?

Also, interestingly, seems like we're not overwriting the etag, but adding one?