chore: use t.Cleanup() for integration tests cleanup

[rarguelloF]

Use t.Cleanup to make sure the cleanup logic is registered right after the resource is created and always gets executed when the test finishes.

[eliottness]

Skimmed through everything. LGTM 👍

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.66%. Comparing base (6b2ab98) to head (9f5f95e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #382      +/-   ##
==========================================
- Coverage   61.33%   60.66%   -0.67%     
==========================================
  Files         171      171              
  Lines       12020    11950      -70     
==========================================
- Hits         7372     7250     -122     
- Misses       4162     4238      +76     
+ Partials      486      462      -24     

Components	Coverage Δ
Generators	76.98% <ø> (ø)
Instruments	88.05% <ø> (ø)
Go Driver	73.13% <ø> (ø)
Toolexec Driver	70.64% <ø> (ø)
Aspects	71.73% <ø> (ø)
Injector	73.72% <ø> (ø)
Job Server	63.45% <ø> (-4.11%)	⬇️
Integration Test Suite	54.24% <100.00%> (-0.28%)	⬇️
Other	60.66% <100.00%> (-0.67%)	⬇️

Files with missing lines	Coverage Δ
...integration-tests/tests/99designs.gqlgen/gqlgen.go	100.00% <ø> (ø)
_integration-tests/tests/aws.v1/aws.go	94.28% <ø> (-0.59%)	⬇️
_integration-tests/tests/aws.v2/base.go	93.61% <ø> (-0.51%)	⬇️
...egration-tests/tests/aws.v2/load_default_config.go	100.00% <ø> (ø)
_integration-tests/tests/aws.v2/new_config.go	100.00% <ø> (ø)
_integration-tests/tests/aws.v2/struct_literal.go	100.00% <ø> (ø)
...tegration-tests/tests/aws.v2/struct_literal_ptr.go	100.00% <ø> (ø)
_integration-tests/tests/chi.v5/chi.go	100.00% <100.00%> (ø)
...gration-tests/tests/confluent-kafka-go.v1/kafka.go	100.00% <ø> (ø)
...-tests/tests/confluent-kafka-go.v1/skip_windows.go	50.00% <ø> (+10.00%)	⬆️
... and 46 more

... and 2 files with indirect coverage changes