fix: increase number of histogram buckets for syncer latencies

[kushsharma]

• newly added buckets in seconds

{.005, .01, .025, .05, .1, .25, .5, 1, 2.5, 5, 10, 20, 40, 90, 180}

• context cancellation will stop syncing early instead of continuing to iterate over items
• tests for policy service

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
frontier	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 2, 2024 1:25pm

[coveralls]

Pull Request Test Coverage Report for Build 10216392616

Details

• 0 of 515 (0.0%) changed or added relevant lines in 10 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.04%) to 9.506%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
internal/metrics/db.go	0	1	0.0%
internal/metrics/stripe.go	0	2	0.0%
billing/customer/service.go	0	3	0.0%
billing/invoice/service.go	0	3	0.0%
billing/checkout/service.go	0	6	0.0%
billing/subscription/service.go	0	6	0.0%
internal/api/v1beta1/mocks/checkout_service.go	0	37	0.0%
core/policy/mocks/relation_service.go	0	74	0.0%
core/policy/mocks/role_service.go	0	84	0.0%
core/policy/mocks/repository.go	0	299	0.0%

Totals
Change from base Build 10191907741:	0.04%
Covered Lines:	10358
Relevant Lines:	108961

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💛 - Coveralls