include gservices flags in the OS

[inthewaves]

Closes GrapheneOS/os-issue-tracker#7658

Changelist:

• add gservices flags provider platform_packages_apps_GmsCompat#289
• add gservices flags provider redirect hook platform_frameworks_base#408

Currently only eUICC-related flags are being consumed. Note that
euicc.experiment.Activation__profile_specific_behavior appears to be region specific (adevtool
doesn't capture this accurately yet) and likely not used by EuiccGoogle.

In July 2026 update (CP2A.260705.006), EuiccSupportPixel added a EsimGcRecoveryService which is
hardcoded to only run on 9th and 10th gen Pixels. Its use is also gated on the gservices flag
euiccpixel.experiment.Ota__should_enable_esim_gc_recovery.

When this flag is disabled or the device is not a 9th or 10th gen Pixel, this is logged:

I EuiccSupportPixel: Checking on slot status changed.
I EuiccSupportPixel: eSIM GC recovery check failed: flag is not enabled or device doesn't support GC recovery.

When this flag is enabled but eSIM GC recovery didn't need to run, this is logged:

I EuiccSupportPixel: Checking on slot status changed.
I EuiccSupportPixel: eSIM is PRESENT but EID is not all zeros.

On some other device generations, there is another eSIM recovery path which is blocked by the
gservices flag euiccpixel.experiment.Ota__support_se_recovery, e.g. cheetah.

When the SERecovery flag is disabled, this is logged:

I EuiccSupportPixel: [SERecovery] SE Recovery is not supported

When this flag is enabled but SERecovery didn't need to run, this is logged:

I EuiccSupportPixel: [SERecovery] Recovery Counter value: 0
I EuiccSupportPixel: [SERecovery] SERecoveryReceiver registered dynamically

• Test: on tokay, rango, caiman: The "eSIM is PRESENT but EID is not all zeros." log was observed,
  indicating the flag was passed to EuiccSupportPixel correctly
• Test: on cheetah, the two SERecovery logs "Recovery Counter value: 0" and "SERecoveryReceiver" were
  observed, indicating the flag was passed to EuiccSupportPixel correctly
• Test: eSIMs were added, calls/SMS/MMS/data were functional, and eSIMs were able to be deleted