Remove code using `certificatesPerName` & `newOrdersRL` tables.
Deprecate `DisableLegacyLimitWrites` & `UseKvLimitsForNewOrder` flags.
Remove legacy `ratelimit` package.
Delete these RA test cases:
- `TestAuthzFailedRateLimitingNewOrder` (rl:
`FailedAuthorizationsPerDomainPerAccount`)
- `TestCheckCertificatesPerNameLimit` (rl: `CertificatesPerDomain`)
- `TestCheckExactCertificateLimit` (rl: `CertificatesPerFQDNSet`)
- `TestExactPublicSuffixCertLimit` (rl: `CertificatesPerDomain`)
Rate limits in NewOrder are now enforced by the WFE, starting here:
5a9b4c4b18/wfe2/wfe.go (L781)
We collect a batch of transactions to check limits, check them all at
once, go through and find which one(s) failed, and serve the failure
with the Retry-After that's furthest in the future. All this code
doesn't really need to be tested again; what needs to be tested is that
we're returning the correct failure. That code is
`NewOrderLimitTransactions`, and the `ratelimits` package's tests cover
this.
The public suffix handling behavior is tested by
`TestFQDNsToETLDsPlusOne`:
5a9b4c4b18/ratelimits/utilities_test.go (L9)
Some other RA rate limit tests were deleted earlier, in #7869.
Part of #7671.
e4668b4ca7