NET-6204- Repeating error log in consul-connect-injector

[sophie-gairo]

Changes proposed in this PR:
-dont error on timeouts in gateway

How I expect reviewers to test this PR:
Setup a consul server and let it sit for >5 minutes, we should not see this error pop up

Checklist:

• Tests added
• CHANGELOG entry added

[sophie-gairo]

no error after 5 minutes of consul server running

[jm96441n]

LGTM

[nathancoleman]

I wish we had a better way to do error handling in general, but this matches what we're doing elsewhere

consul-k8s/control-plane/api-gateway/cache/consul.go

Lines 196 to 206 in 2d03f3e

	entries, meta, err := client.ConfigEntries().List(kind, opts.WithContext(ctx))
	if err != nil {
	// if we timeout we don't care about the error message because it's expected to happen on long polls
	// any other error we want to alert on
	if !strings.Contains(strings.ToLower(err.Error()), "timeout") &&
	!strings.Contains(strings.ToLower(err.Error()), "no such host") &&
	!strings.Contains(strings.ToLower(err.Error()), "connection refused") {
	c.logger.Error(err, fmt.Sprintf("error fetching config entries for kind: %s", kind))
	}
	continue
	}