Fix require for oncall scripts

[zachmargolis]

Somehow I broke scripts that use the cloudwatch client by adding this require in #9098

before:

identity-idp:main> aws-vault exec prod-power -- ./bin/oncall/email-deliveries c7abcdef
<internal:/.rbenv/versions/3.2.2/lib/ruby/3.2.0/rubygems/core_ext/kernel_require.rb>:148:in `require': cannot load such file -- identity/hostdata (LoadError)

after:

> aws-vault exec prod-power -- ./bin/oncall/email-deliveries abcdef
[ Querying logs ] --=---=---=---=---=---=---=---=-----=---=---