feat(netsim): filter tests (#3946)

## Description

Improves on the current filtering logistics of netsim. Instead of just a
skiplist, you now have a filter field. Depending on prefix you either
run it:
- empty - no filtering
- prefix the list with `skip:` to skip specific tests in a run
- prefix the list with `only:` to only run specific tests
- defaults to `only:` if you just provide a list without a prefix

## Breaking Changes

<!-- Optional, if there are any breaking changes document them,
including how to migrate older code. -->

## Notes & open questions

<!-- Any notes, remarks or open questions you have to make about the PR.
-->

## Change checklist
<!-- Remove any that are not relevant. -->
- [ ] Self-review.
- [ ] Documentation updates following the [style
guide](https://rust-lang.github.io/rfcs/1574-more-api-documentation-conventions.html#appendix-a-full-conventions-text),
if relevant.
- [ ] Tests if relevant.
- [ ] All breaking changes documented.
- [ ] List all breaking changes in the above "Breaking Changes" section.
- [ ] Open an issue or PR on any number0 repos that are affected by this
breaking change. Give guidance on how the updates should be handled or
do the actual updates themselves. The major ones are:
    - [ ] [`quic-rpc`](https://github.com/n0-computer/quic-rpc)
    - [ ] [`iroh-gossip`](https://github.com/n0-computer/iroh-gossip)
    - [ ] [`iroh-blobs`](https://github.com/n0-computer/iroh-blobs)
    - [ ] [`dumbpipe`](https://github.com/n0-computer/dumbpipe)
    - [ ] [`sendme`](https://github.com/n0-computer/sendme)

Author: Arqu

.github/workflows/ci.yml

@@ -351,7 +351,7 @@ jobs:
       netsim_branch: "main"
       sim_paths: ${{ github.event_name == 'pull_request' && 'sims/integration' || 'sims/iroh/iroh.json,sims/integration' }}
       pr_number: ${{ github.event.pull_request.number || '' }}
-      skip: ${{ github.event_name == 'pull_request' && 'intg_iroh_full__1_to_3,intg_iroh_full__1_to_1x3,intg_iroh_relay_only__1_to_3' || '' }}
+      filter: ${{ github.event_name == 'pull_request' && 'skip:intg_iroh_full__1_to_3,intg_iroh_full__1_to_1x3,intg_iroh_relay_only__1_to_3' || '' }}
 
   codespell:
     timeout-minutes: 30

.github/workflows/netsim_runner.yaml

@@ -39,7 +39,8 @@ on:
         required: false
         type: boolean
         default: false
-      skip:
+      filter:
+        description: "Test filter: 'skip:test1,test2' to exclude or 'only:test1,test2' to run exclusively"
         required: false
         type: string
         default: ""
@@ -81,7 +82,8 @@ on:
         required: false
         type: boolean
         default: false
-      skip:
+      filter:
+        description: "Test filter: 'skip:test1,test2' to exclude or 'only:test1,test2' to run exclusively. No prefix defaults to only."
         required: false
         type: string
         default: ""
@@ -147,14 +149,24 @@ jobs:
       continue-on-error: true
       run: |
         cd ../chuck/netsim
-        # split sim_paths by comma
         IFS=',' read -ra sim_paths <<< "${{ inputs.sim_paths }}"
         rust_log="${{ inputs.rust_log }}"
+        filter="${{ inputs.filter }}"
+        filter_flag=""
+        if [[ -n "${filter}" ]]; then
+          if [[ "${filter}" == skip:* ]]; then
+            filter_flag="--skip=${filter#skip:}"
+          elif [[ "${filter}" == only:* ]]; then
+            filter_flag="--only=${filter#only:}"
+          else
+            filter_flag="--only=${filter}"
+          fi
+        fi
         for sim_path in "${sim_paths[@]}"; do
           if [[ -n "${rust_log}" ]]; then
-            sudo RUST_LOG="${rust_log}" python3 main.py --max-workers=${{ inputs.max_workers }} ${{ inputs.skip && format('--skip={0}', inputs.skip) || ''}} --integration $sim_path
+            sudo RUST_LOG="${rust_log}" python3 main.py ${filter_flag} --max-workers=${{ inputs.max_workers }} --integration $sim_path
           else
-            sudo python3 main.py --max-workers=${{ inputs.max_workers }} ${{ inputs.skip && format('--skip={0}', inputs.skip) || ''}} --integration $sim_path
+            sudo python3 main.py ${filter_flag} --max-workers=${{ inputs.max_workers }} --integration $sim_path
           fi
         done