fix(instance): add web key generation to instance defaults (#9815)

# Which Problems Are Solved

Webkeys were not generated with new instances when the webkey feature
flag was enabled for instance defaults. This would cause a redirect loop
with console for new instances on QA / coud.

# How the Problems Are Solved

- uncomment the webkeys section on defaults.yaml
- Fix field naming of webkey config

# Additional Changes

- Add all available features as comments.
- Make the improved performance type enum parsable from the config,
untill now they were just ints.
- Running of the enumer command created missing enum entries for feature
keys.

# Additional Context

- Needs to be back-ported to v3 / next-rc

Co-authored-by: Livio Spring <livio.a@gmail.com>

internal/feature/feature.go

@@ -57,10 +57,11 @@ type Features struct {
 	ConsoleUseV2UserApi             bool                      `json:"console_use_v2_user_api,omitempty"`
 }
 
+//go:generate enumer -type ImprovedPerformanceType -trimprefix ImprovedPerformanceType -text
 type ImprovedPerformanceType int32
 
 const (
-	ImprovedPerformanceTypeUnknown = iota
+	ImprovedPerformanceTypeUnspecified ImprovedPerformanceType = iota
 	ImprovedPerformanceTypeOrgByID
 	ImprovedPerformanceTypeProjectGrant
 	ImprovedPerformanceTypeProject