## What changed?
<!-- Describe what has changed in this PR -->
Open up Grafana Tempo's OTEL HTTP port, too.
## Why?
<!-- Tell your future self why have you made these changes -->
It's useful to send traces via curl.
## How did you test it?
<!-- How have you verified this change? Tested locally? Added a unit
test? Checked in staging env? -->
## Potential risks
<!-- Assuming the worst case, what can be broken when deploying this
change to production? -->
## Documentation
<!-- Have you made sure this change doesn't falsify anything currently
stated in `docs/`? If significant
new behavior is added, have you described that in `docs/`? -->
## Is hotfix candidate?
<!-- Is this PR a hotfix candidate or does it require a notification to
be sent to the broader community? (Yes/No) -->
## What changed?
<!-- Describe what has changed in this PR -->
Added Grafana Tempo - an OTEL collector - to the developer setup.
Since we're already using Grafana, Tempo seemed like a logical choice.
## Why?
<!-- Tell your future self why have you made these changes -->
It allows developers to see all the RPC calls they are making (e.g. when
running the server locally or a functional test).
Tempo allows filtering by workflow ID. _(note that not _all_ places are
tagged yet, but lots of them)_
## How did you test it?
<!-- How have you verified this change? Tested locally? Added a unit
test? Checked in staging env? -->
```
make start-grafana-tempo
make OTEL=true start
```
```
tctl --ns default namespace register
tctl wf start --tq test --wid test -wt test
```
<img width="3352" alt="image"
src="https://github.com/user-attachments/assets/5809691a-da32-4a04-8e80-700f8acd47e5"
/>
And running a functional test from the IDE:
<img width="3346" alt="image"
src="https://github.com/user-attachments/assets/061bfaf3-0a34-4b4e-a06c-497dfa3a948a"
/>
## Potential risks
<!-- Assuming the worst case, what can be broken when deploying this
change to production? -->
## Documentation
<!-- Have you made sure this change doesn't falsify anything currently
stated in `docs/`? If significant
new behavior is added, have you described that in `docs/`? -->
Updated docs/development/tracing.md
## Is hotfix candidate?
<!-- Is this PR a hotfix candidate or does it require a notification to
be sent to the broader community? (Yes/No) -->
