feat: Add support for cilium 1.15 and update cilium to v1.15.4

[deveshk0]

What type of PR is this?

/kind feature

What this PR does / why we need it:

• Adds support for Cilium 1.15.
• Update default cilium version to v1.15.4

Which issue(s) this PR fixes:

Fixes #10972

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

- Adds support for cilium v1.15
- Adds support for `cilium_l2announcements` to replace metallb with cilium l2 announcements, defaults to `false`
- Adds support for `cilium_loadbalancer_mode` to switch bpf-lb-mode between snat, dsr or hybrid, default to `snat`

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: deveshk0 / name: Devesh Kumar (a5b7281)

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @deveshk0. Thanks for your PR.

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[mzaian]

/ok-to-test

[yankay]

HI @cyclinder

Would you please help to review it.

[cyclinder]

@yankay sure! I'll take a look soon.

[cyclinder]

Thanks for the contribution! @deveshk0, overall look LGTM, only a comment.

[cyclinder]

/lgtm
/cc @yankay

Thanks!

[deveshk0]

@yankay can you approve this?

[yankay]

Thanks @deveshk0
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: deveshk0, yankay

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