fix(test): stop counting unrelated requests in "stops posting" tests

[EmilyRagan]

Problem

Both stops posting to the api after closing tests counted every request the page made:

page.on('request', () => { requestCount++ })

The intent is to verify a tool tears down its polling interval when you navigate away. But because the listener is unfiltered, any unrelated periodic traffic that happens to fire in the 2 second window after the count snapshot fails the test — auth token refresh, notification polling, cable reconnects.

Seen in enterprise CI (run 32767849978, run 32073575025, etc), off by exactly one request:

Error: expect(received).toBe(expected)
Expected: 172
Received: 173
  > 160 |   expect(requestCount).toBe(count) // no change

Fix

Count only the polling call each tool actually makes:

• packet-viewer.p.spec.ts — get_tlm_packet, from the setInterval in PacketViewer.vue. The test navigates to INST/ADCS, so it takes the regular-packet branch, not the LATEST / get_tlm_values one.
• cmd-tlm-server/file-menu.p.spec.ts — get_all_interface_info, from InterfacesTab's update() driven by the shared Updater.js mixin. That tab is the default child route.

Matching is on the JSON-RPC body (openc3Api.js posts { jsonrpc, method, ... } to /openc3-api/api), with the quotes included so "get_tlm_packet" can't prefix-match get_tlm_values.

Each test also now asserts expect(requestCount).toBeGreaterThan(0) before navigating away. This is load-bearing: if the filter string were ever wrong the count would stay 0 and the test would pass vacuously, silently testing nothing.

Verification

• Ran against a local enterprise stack, --repeat-each=3, both files — all pass. Prettier clean.
• Enterprise run in CI against this branch: run 32902428251 (other failures here, will be addressed separately)

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.13%. Comparing base (7a8e9f2) to head (992ca0c).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3770      +/-   ##
==========================================
- Coverage   79.16%   79.13%   -0.04%     
==========================================
  Files         894      894              
  Lines       66865    66865              
  Branches     2599     2599              
==========================================
- Hits        52936    52912      -24     
- Misses      13266    13292      +26     
+ Partials      663      661       -2     

Flag	Coverage Δ
frontend	66.05% <ø> (-0.12%)	⬇️
python	79.27% <ø> (-0.05%)	⬇️
ruby-api	82.09% <ø> (ø)
ruby-backend	84.44% <ø> (ø)

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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