[Telemetry] Configure feature flags

This change configures the feature flags for M115. This means enabling
the os.events permission as well as all event APIs but onSdCardInfo.

Bug: b/281034603, launch/4250288
Test: unit_tests --gtest_filter=
"*ExtensionManifestChromeOSSystemExtensionTest*"
Test: browser_tests --gtest_filter="*TelemetryExtension*"

Change-Id: I5b72df54db90948330b74b3a32fe4b64450d5966
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4506963
Reviewed-by: Oleh Lamzin <lamzin@google.com>
Commit-Queue: Bastian Kersting <bkersting@google.com>
Cr-Commit-Position: refs/heads/main@{#1141335}