[tmpnet] Update to use new monitoring urls (*-poc)

[marun]

Why this should be merged

The new monitoring stack is located at different URLs.

How this works

• Updated to avalanchego version containing [tmpnet] Update monitoring urls from *-experimental to *-poc avalanchego#3306
• Updated loki and prometheus scripts to use the new URLs
• Updated action usage to use a tag using the new URLs

How this was tested

• Load and warp jobs are emitting the new URLs
• New URLs are populated with data.

How is this documented

• N/A

[marun]

Converted to draft to avoid merging prematurely. I realized I need to have a tag for 35c66e33f in avalanchego and then update the action usage in this PR to use the new tag.

[marun]

Updated to use the current action, and manually checked that the warp and load test jobs were emitting correct links and sending metrics and logs.