make typescript template a better echo

[lkingland]

typescript template now echoes a bit better. E2E tests use a GET and expect an echo to include the URL requested.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.16%. Comparing base (a664f9e) to head (5e2639c).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3096      +/-   ##
==========================================
+ Coverage   57.44%   59.16%   +1.71%     
==========================================
  Files         134      134              
  Lines       17315    17315              
==========================================
+ Hits         9947    10244     +297     
+ Misses       6460     6107     -353     
- Partials      908      964      +56     

Flag	Coverage Δ
e2e-tests	40.28% <ø> (+7.51%)	⬆️
integration-tests	53.94% <ø> (+1.65%)	⬆️
unit-tests	46.27% <ø> (ø)

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[gauron99]

/retest

[gauron99]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: gauron99, lkingland

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