Signatures escape same Metadata.Properties map field to heap

[geyslan]

Description

This can cause a data race as detected in: https://github.com/aquasecurity/tracee/actions/runs/10814517981/job/30001186085?pr=4252#step:6:592

INFO: 
INFO: = TEST: TRC-1010 =================================================
INFO: 
INFO: 
INFO: UP AND RUNNING
INFO:

...

goroutine 20 [running]:
reflect.mapiternext(0x2104360?)
	/tmp/go/pkg/mod/golang.org/[email protected]/src/runtime/map.go:1392 +0x1c
reflect.(*MapIter).Next(0x4000057300?)
	/tmp/go/pkg/mod/golang.org/[email protected]/src/reflect/value.go:2005 +0x78
encoding/json.mapEncoder.encode({0x4000057468?}, 0x4000d1fd80, {0x2145200?, 0x4000d1fd78?, 0x20782c0?}, {0xd?, 0x0?})
	/tmp/go/pkg/mod/golang.org/[email protected]/src/encoding/json/encode.go:745 +0x28c
encoding/json.structEncoder.encode({{{0x40004e3d48, 0x4, 0x4}, 0x4002fcad80, 0x4002fcadb0}}, 0x4000d1fd80, {0x22c5d00?, 0x4000d1fd40?, 0x96?}, {0xa8?, ...})
	/tmp/go/pkg/mod/golang.org/[email protected]/src/encoding/json/encode.go:704 +0x190
encoding/json.ptrEncoder.encode({0x4000057688?}, 0x4000d1fd80, {0x2025240?, 0x4000c803a8?, 0x4000d1fd80?}, {0xb?, 0x0?})
	/tmp/go/pkg/mod/golang.org/[email protected]/src/encoding/json/encode.go:876 +0x1ec
encoding/json.structEncoder.encode({{{0x4000392c08, 0x20, 0x23}, 0x4002fcae40, 0x4002fcae70}}, 0x4000d1fd80, {0x23e0000?, 0x4000c801e0?, 0x4000057818?}, {0xfc?, ...})
	/tmp/go/pkg/mod/golang.org/[email protected]/src/encoding/json/encode.go:704 +0x190
encoding/json.(*encodeState).reflectValue(0x4000d1fd80, {0x23e0000?, 0x4000c801e0?, 0xeb0e98?}, {0x38?, 0x0?})
	/tmp/go/pkg/mod/golang.org/[email protected]/src/encoding/json/encode.go:321 +0x70
encoding/json.(*encodeState).marshal(0x40000578b8?, {0x23e0000?, 0x4000c801e0?}, {0x0?, 0xfb?})
	/tmp/go/pkg/mod/golang.org/[email protected]/src/encoding/json/encode.go:297 +0xc0
encoding/json.Marshal({0x23e0000, 0x4000c801e0})
	/tmp/go/pkg/mod/golang.org/[email protected]/src/encoding/json/encode.go:163 +0x94
github.com/aquasecurity/tracee/pkg/cmd/printer.jsonEventPrinter.Print({{_, _}}, {0x17f43b24efef8cbf, 0x17f43b24edad3d83, 0x0, 0x12, 0x1701, 0x12, 0xc, 0x3200, ...})
	/actions-runner/_work/tracee/tracee/pkg/cmd/printer/printer.go:396 +0x48
github.com/aquasecurity/tracee/pkg/cmd/printer.startPrinter(0x4001d87360, 0x4001d4b5c0, 0x4000101440, {0x3588860, 0x4000112d60})
	/actions-runner/_work/tracee/tracee/pkg/cmd/printer/broadcast.go:103 +0x64
created by github.com/aquasecurity/tracee/pkg/cmd/printer.(*Broadcast).Init in goroutine 1
	/actions-runner/_work/tracee/tracee/pkg/cmd/printer/broadcast.go:52 +0x1f4
...

TRC-1010 is cgroup_release_agent, anyhow, all signatures should be checked.

[geyslan]

@NDStrahilevitz FYI as it was detected in #4252 tests.

[geyslan]

Fixed by this reversion: #4321