[release-1.22] added perf test for 1.22

[istio-testing]

Manual cherrypick required.

#15196 failed to apply on top of branch "release-1.22":

Applying: istio 1.20 performance result
Using index info to reconstruct a base tree...
M	content/en/docs/ops/deployment/performance-and-scalability/index.md
A	content/en/docs/ops/deployment/performance-and-scalability/latency_p90_fortio_with_jitter.svg
A	content/en/docs/ops/deployment/performance-and-scalability/latency_p99_fortio_with_jitter.svg
Falling back to patching base and 3-way merge...
Auto-merging content/en/docs/ops/deployment/performance-and-scalability/index.md
CONFLICT (content): Merge conflict in content/en/docs/ops/deployment/performance-and-scalability/index.md
CONFLICT (rename/delete): content/en/docs/ops/deployment/performance-and-scalability/latency_p99_fortio_with_jitter.svg deleted in istio 1.20 performance result and renamed to archive/v1.19/docs/ops/deployment/performance-and-scalability/latency_p99_fortio_with_jitter.svg in HEAD. Version HEAD of archive/v1.19/docs/ops/deployment/performance-and-scalability/latency_p99_fortio_with_jitter.svg left in tree.
CONFLICT (rename/delete): content/en/docs/ops/deployment/performance-and-scalability/latency_p90_fortio_with_jitter.svg deleted in istio 1.20 performance result and renamed to archive/v1.19/docs/ops/deployment/performance-and-scalability/latency_p90_fortio_with_jitter.svg in HEAD. Version HEAD of archive/v1.19/docs/ops/deployment/performance-and-scalability/latency_p90_fortio_with_jitter.svg left in tree.
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 istio 1.20 performance result
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".