feat: set billing customer credit min limit

[kushsharma]

• If a billing account credit min limit is set less then 0, it works as overdraft. Default is 0.
• If a org billing account is in overdraft state, it's not allowed to create new billing account unless the dues are settled.
• Setting this limit more then 0 works as min purchase requirement for the account.
• Only platform admins can change the account limits.
• feat(frontier): billing account credit min limit proton#370

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
frontier	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 4, 2024 4:47am

[coveralls]

Pull Request Test Coverage Report for Build 11174148935

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 29 of 584 (4.97%) changed or added relevant lines in 14 files are covered.
• 4 unchanged lines in 3 files lost coverage.
• Overall coverage decreased (-0.03%) to 9.669%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
cmd/serve.go	0	2	0.0%
billing/customer/service.go	14	17	82.35%
pkg/server/interceptors/authorization.go	0	3	0.0%
internal/api/v1beta1/billing_customer.go	0	6	0.0%
proto/v1beta1/admin_grpc.pb.go	0	26	0.0%
internal/store/postgres/billing_customer_repository.go	3	30	10.0%
billing/customer/mocks/repository.go	0	37	0.0%
internal/api/v1beta1/mocks/customer_service.go	0	37	0.0%
billing/customer/mocks/credit_service.go	0	46	0.0%
internal/store/postgres/billing_transactions_repository.go	9	69	13.04%

Files with Coverage Reduction	New Missed Lines	%
internal/store/postgres/billing_transactions_repository.go	1	3.17%
proto/v1beta1/admin_grpc.pb.go	1	0.0%
proto/v1beta1/admin.pb.gw.go	2	0.0%

Totals
Change from base Build 11159729320:	-0.03%
Covered Lines:	11008
Relevant Lines:	113854

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💛 - Coveralls