feat: add metrics configuration to soak-test deployment

[wtf-is-flying]

What was changed

This patch adds a metric named port and a PROMETHEUS_ENDPOINT environment variable to the soak-test deployment.

Why?

I am trying to follow this blog post https://temporal.io/blog/scaling-temporal-the-basics to scale up my Temporal Service.

Unfortunately, I wasn't able to collect StartExecutionWorkflow latencies. I found that the deployment configuration was missing both a metric named port and a PROMETHEUS_ENDPOINT environment variable, which explained why I wasn't collecting any metric from this deployment.

Checklist

2. How was this tested:

This is a before/after view 🙂 we notice that we start collecting StartExecutionWorkflow request latencies.

[CLAassistant]

All committers have signed the CLA.

[wtf-is-flying]

I can't sign the CLA (Version selector/field is empty). 🙁

[robholland]

Can you try the CLA thing again? It's a bit flakey unfortunately :(

[wtf-is-flying]

It's done!

[robholland]

Merged and released new chart version, thanks!