Remove deprecated cipher suites from Kyma gateway

[barchw]

Description

Changes proposed in this pull request:

• Remove deprecated cipher suites from kyma gateway
• Remove leftover istio component tests

Related issue(s)

• Default Kyma gateway TLS adjustments #17616

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[barchw]

/test all

[kyma-bot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[barchw]

/test all

[barchw]

/test all

[kyma-bot]

@barchw: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pre-main-kyma-istio-reconcilation-k3d	f92fad9	link	true	/test pre-main-kyma-istio-reconcilation-k3d
pre-main-kyma-eval-istio-integration-k3d	f92fad9	link	true	/test pre-main-kyma-eval-istio-integration-k3d
pre-main-kyma-prod-istio-integration-k3d	f92fad9	link	true	/test pre-main-kyma-prod-istio-integration-k3d
pull-kyma-governance	f92fad9	link	false	/test pull-kyma-governance

Full PR test history. Your PR dashboard.

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