Envoy 1.26 bump (includes inja bump)

[jbohanon]

Description

Bump envoy-gloo-ee to 1.26 version. The investigation around this change can be found in this doc. This bump will also include latest version of Inja.

This is really noisy due to protoc-gen-go dep bump, but the real changes are in

• Makefile
• docs/content/guides/traffic_management/request_processing/transformations/_index.md
• go.mod
• projects/gloo/api/external/envoy/config/core/v3/proxy_protocol.proto
• projects/gloo/api/external/envoy/extensions/transformation/transformation.proto (comment only)
• projects/gloo/pkg/plugins/dynamic_forward_proxy/plugin.go
• projects/gloo/pkg/plugins/hcm/testing/expected_hcm_fields.json
• test/kube2e/gateway/gateway_test.go

Checklist:

• I included a concise, user-facing changelog (for details, see https://github.com/solo-io/go-utils/tree/main/changelogutils) which references the issue that is resolved.
• If I updated APIs (our protos) or helm values, I ran make -B install-go-tools generated-code to ensure there will be no code diff
• I followed guidelines laid out in the Gloo Edge contribution guide
• I opened a draft PR or added the work in progress label if my PR is not ready for review
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works

[solo-changelog-bot]

Issues linked to changelog:
#8177

[github-actions]

Visit the preview URL for this PR (updated for commit 8c09ed7):

https://gloo-edge--pr8440-envoy-gloo-bump-for-pf3tvz0t.web.app

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[nfuden]

Can we test this with 1.25?

[jbohanon]

@solo-io/solo-docs sorry about all of the noise in this file. The real changes are on L172, L174, L385, L388

[nfuden]

I think next time we do a seperate pr for the protobuf bump to remove it from functional code XD