Merge the check_domain_fee nomulus command into check_domain

I'm tired of running check_domain only to then realize I needed to run
check_domain_fee instead because the domain ended up being premium. We require
the use of the fee extension to register domains on all of our TLDs anyway so we
might as well always be sending the fee extension when checking domains
too. There's no additional harm in sending along the fee extension (it only
sends back additional information that is often useful), so just make that the
default and remove the extra unnecessary command.

Note that check_domain_claims can't be merged in too because it fundamentally
works differently. It doesn't query the availability of domain names for
registration, just whether they're trademarked.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=198097326

java/google/registry/tools/RegistryTool.java

@@ -33,7 +33,6 @@ public final class RegistryTool {
           .put("canonicalize_labels", CanonicalizeLabelsCommand.class)
           .put("check_domain", CheckDomainCommand.class)
           .put("check_domain_claims", CheckDomainClaimsCommand.class)
-          .put("check_domain_fee", CheckDomainFeeCommand.class)
           .put("check_snapshot", CheckSnapshotCommand.class)
           .put("convert_idn", ConvertIdnCommand.class)
           .put("count_domains", CountDomainsCommand.class)