mongo: fix bson int32 parsing

[mmat11]

Fix silent bug in bson int32 parsing.

The added test would previously fail:

    mongo_detect_transform_test.go:431:
        	Error Trace:	/Users/mattia.meleleo/cx/opentelemetry-ebpf-instrumentation/pkg/ebpf/common/mongo_detect_transform_test.go:431
        	Error:      	Not equal:
        	            	expected: 12345
        	            	actual  : 0
        	Test:       	TestGetMongoInfoErrorRequest
        	Messages:   	Expected ErrorCode to be 12345
--- FAIL: TestGetMongoInfoErrorRequest (0.00s)
=== RUN   TestGetMongoInfoErrorCodeFromBsonRoundTrip
    mongo_detect_transform_test.go:467:
        	Error Trace:	/Users/mattia.meleleo/cx/opentelemetry-ebpf-instrumentation/pkg/ebpf/common/mongo_detect_transform_test.go:467
        	Error:      	Not equal:
        	            	expected: 11000
        	            	actual  : 0
        	Test:       	TestGetMongoInfoErrorCodeFromBsonRoundTrip
        	Messages:   	error code must be parsed from int32 BSON value

[codecov]

Codecov Report

❌ Patch coverage is 11.11111% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 43.87%. Comparing base (b2244db) to head (86a1273).
⚠️ Report is 14 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/ebpf/common/mongo_detect_transform.go	11.11%	5 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1453      +/-   ##
==========================================
- Coverage   43.93%   43.87%   -0.06%     
==========================================
  Files         313      313              
  Lines       34213    34216       +3     
==========================================
- Hits        15030    15013      -17     
- Misses      18207    18217      +10     
- Partials      976      986      +10     

Flag	Coverage Δ
integration-test	21.51% <0.00%> (-0.21%)	⬇️
integration-test-arm	0.00% <0.00%> (ø)
integration-test-vm-x86_64-5.15.152	?
integration-test-vm-x86_64-6.10.6	?
k8s-integration-test	2.29% <0.00%> (+<0.01%)	⬆️
oats-test	0.00% <0.00%> (ø)
unittests	44.86% <11.11%> (-0.04%)	⬇️

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