[patch] Release Vald v1.7.6

[kpango]

⚠️ ⚠️ ⚠️ Warning ⚠️ ⚠️ ⚠️

• v1.7.6 does not support vald-agent-sidecar for some reason.
• You can use the vald-agent-sidecar by setting the vald-agent-ngt image tag as v1.7.5 or earlier.
• We will support vald-agent-sidecar in the future version again.

✨ New feature

• Add search algorithm benchmark and update search aggregation algo #2044
• Add broken index backup #2034
• Add network policy #2022

♻️ Refactor

• Add save index operation log #2048
• Added flg that can disable to ingress defaultBackend #1976
• Refactor and Add test for service/ngt.go #2040
• Add e2e envs to devcontainer #2032
• Update RoundTrip retry condition #2033

🐛 Bugfix

• Fix fp16 problems #2049
• Add KUBECTL_VERSION value to workflow #2052
• Remove sudo from kubectl and small refactor around os/arch #2037
• Disable vtproto pooling due to the performance degradation #2063
• Fix to create index_path when it does not exists #2060

✏️ Document

• Add documentation for devcontiner #2042
• Create README for each docker image #2014

💚 CI

• Disable deepsource TestCoverage due to the Deepsource Coverage collect server timeout is too short for Vald testing #2038
• Update Docker Build workflow with forked sources #2036
• Fix e2e-max-dim test #2028
• Fix E2E actions on PR #2025
• Change E2E actions to use local charts on PR #2024
• Update format chatops #2021
• Format code with prettier and gofumpt #2015

📈 Metrics/Tracing

• Add command to deploy monitoring stack #2030
• Fixed duplicate counting in CPU graphs #2019

⬆️ Update dependencies

• Update go modules #2053
• Update NGT version #2026

🤝 Contributor

• Add takuyaymd as a contributor for maintenance #2020

[vdaas-ci]

[CHATOPS:HELP] ChatOps commands.

• 🙆‍♀️ /approve - approve
• 💌 /changelog - replace the PR body by changelog details
• 🍱 /format - format codes and add licenses
• ✅ /gen-test - generate test codes
• 🏷️ /label - add labels
• ⏪ /rebase - rebase main
• 🔚 2️⃣ 🔚 /label actions/e2e-deploy - run E2E deploy & integration test