Add offline entitlements diagnostics events

[tonidero]

Description

This adds some new events to get some data into offline entitlements when diagnostics is enabled:

• entered_offline_entitlements_mode
• error_entering_offline_entitlements_mode

[tonidero]

This won't actually be tracked in Grafana, but I thought it would still be useful to send it.

[aboedo]

at the very least it'll be useful in elastic if we're looking through logs of a single customer

[tonidero]

I thought about making this a parameter instead of relying on processing the error... But this cleans it up a bit IMO.

[codecov]

Codecov Report

Attention: Patch coverage is 84.00000% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 83.38%. Comparing base (0162a16) to head (0f3bfbc).
Report is 3 commits behind head on main.

❗ Current head 0f3bfbc differs from pull request most recent head d5f5920. Consider uploading reports for the commit d5f5920 to get more accurate results

Files	Patch %	Lines
...flineentitlements/OfflineCustomerInfoCalculator.kt	33.33%	0 Missing and 2 partials ⚠️
...purchases/common/diagnostics/DiagnosticsTracker.kt	93.33%	0 Missing and 1 partial ⚠️
.../offlineentitlements/OfflineEntitlementsManager.kt	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1671      +/-   ##
==========================================
- Coverage   83.38%   83.38%   -0.01%     
==========================================
  Files         220      220              
  Lines        7486     7510      +24     
  Branches     1053     1059       +6     
==========================================
+ Hits         6242     6262      +20     
  Misses        830      830              
- Partials      414      418       +4     

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[aboedo]

looking good, minor comments

[aboedo]

at the very least it'll be useful in elastic if we're looking through logs of a single customer

[aboedo]

Suggested change

	"error_message" to "There was a problem with the operation. Looks like we doesn't support that yet. Check the underlying error for more details.. Underlying error: Offline entitlements are not supported for active inapp purchases. Found active inapp purchases.",
	"error_message" to "There was a problem with the operation. Looks like we don't support that yet. Check the underlying error for more details. Underlying error: Offline entitlements are not supported for active inapp purchases. Found active inapp purchases.",

[aboedo]

I'd also skip the "looks like we don't support that yet" bit entirely, I'm not sure we'll ever be able to support one-times in the first place.
Also... I guess active inapp purchases is technically correct, but like, that sounds like any purchases, right? I'd maybe change the copy to one time purchases for clarity

[aboedo]

it'd be great to add a link to documentation too, we usually use the Rebrandly links for that kind of thing. It helps in case we ever want to document this very specifically, if we have a Rebrandly in place we can update where it points to later on

[tonidero]

I'd also skip the "looks like we don't support that yet" bit entirely

That part is actually more generic, and it's the error message we display every time we get the UnsupportedError code... I could change it, but I would prefer to leave that part as is, since it might apply to something else... But happy to revamp this in our future better error handling exploration!