Upgrade istio to 1.15.0

[nishantapatil3]

Q	A
Bug fix?	no
New feature?	yes
API breaks?	no
Deprecations?	no
License	Apache 2.0

What's in this PR?

Upgrade istio-1.13 to istio-1.15

Why?

To support the latest istio-1.15 on koperator

Additional context

Checklist

• Implementation tested
• Error handling code meets the guideline
• Logging code meets the guideline
• User guide and development docs updated (if needed)

Tests

=== RUN   TestControllers
Running Suite: Controller Suite
===============================
Random Seed: 1663175832
Will run 16 of 16 specs

W0914 10:17:16.363165   68666 warnings.go:70] policy/v1beta1 PodDisruptionBudget is deprecated in v1.21+, unavailable in v1.25+; use policy/v1 PodDisruptionBudget
W0914 10:17:16.365761   68666 warnings.go:70] policy/v1beta1 PodDisruptionBudget is deprecated in v1.21+, unavailable in v1.25+; use policy/v1 PodDisruptionBudget
••••••••••••••••
Ran 16 of 16 Specs in 81.320 seconds
SUCCESS! -- 16 Passed | 0 Failed | 0 Pending | 0 Skipped
--- PASS: TestControllers (81.32s)
PASS
coverage: [no statements]
ok  	github.com/banzaicloud/koperator/controllers/tests	83.327s	coverage: [no statements]
=== RUN   TestControllersWithClusterRegistry
Running Suite: Controller Suite with Cluster Registry
=====================================================
Random Seed: 1663175832
Will run 8 of 8 specs

W0914 10:17:16.423725   68665 warnings.go:70] policy/v1beta1 PodDisruptionBudget is deprecated in v1.21+, unavailable in v1.25+; use policy/v1 PodDisruptionBudget
W0914 10:17:16.425770   68665 warnings.go:70] policy/v1beta1 PodDisruptionBudget is deprecated in v1.21+, unavailable in v1.25+; use policy/v1 PodDisruptionBudget
••••••••
Ran 8 of 8 Specs in 66.528 seconds
SUCCESS! -- 8 Passed | 0 Failed | 0 Pending | 0 Skipped

[CLAassistant]

All committers have signed the CLA.

[panyuenlau]

LGTM.

I am curious if this has been tested with a kafka cluster that is accessible from outside of the Kubernetes cluster via external listener using Istio ingress?

See this docs regarding how the external listeners can be created for testing

Note: the external listener part is not covered with the current tests that we have

[bartam1]

LGTM, I forgot to put length check in the test. I have fixed it.

[pregnor]

LGTM

[pregnor]

Please wait for either @panyuenlau or @hi-im-aren 's approval as well to have proper +2.

[nishantapatil3]

Thanks @panyuenlau @hong6914 , for helping me and testing external listeners using istioingress v1.15.0, PASS!

kcat -b a281d7351225e4546a0d2b5289a94f3e-1977502687.us-west-2.elb.amazonaws.com:29092 -t kafkacat-topic -X enable.ssl.certificate.verification=false -L -v
Metadata for kafkacat-topic (from broker -1: a281d7351225e4546a0d2b5289a94f3e-1977502687.us-west-2.elb.amazonaws.com:29092/bootstrap):
 3 brokers:
  broker 0 at a281d7351225e4546a0d2b5289a94f3e-1977502687.us-west-2.elb.amazonaws.com:19095
  broker 2 at a281d7351225e4546a0d2b5289a94f3e-1977502687.us-west-2.elb.amazonaws.com:19097
  broker 1 at a281d7351225e4546a0d2b5289a94f3e-1977502687.us-west-2.elb.amazonaws.com:19096 (controller)
 1 topics:
  topic "kafkacat-topic" with 1 partitions:
    partition 0, leader 0, replicas: 0, isrs: 0