Whether the codeql result contains function call chain information.

test code:
```
[root@*** test_case]# cat f_open_test_0.cpp
#include
#include
using namespace std;

const char * do_getenv1(const char * name) {
return getenv(name);
}
[root@*** test_case]# cat f_open_test_a.cpp
#include "f_open_test_0.cpp"
extern const char * do_getenv1(const char *);

const char * do_getenv() {
return do_getenv1("FILENAME1");
}

[root@*** test_case]# cat f_open_test_b.cpp
#include "f_open_test_a.cpp"
extern const char * do_getenv();

int main(){
const char * filename1 = do_getenv();
FILE * file1 = fopen(filename1, "r");
}
```
running rule:
fopen-flow-from-getenv.ql

but results file don't contain the function call chain, results like this:
```
"results": [{
"ruleId": "cpp/huawei/member-variable-to-resource-leak",
"ruleIndex": 0,
"rule": {
"id": "cpp/huawei/member-variable-to-resource-leak",
"index": 0
},
"message": {
"text": "This 'fopen' uses data from [call to 'getenv'](1)."
},
"locations": [{
"physicalLocation": {
"artifactLocation": {
"uri": "f_open_test_b.cpp",
"uriBaseId": "%SRCROOT%",
"index": 0
},
"region": {
"startLine": 6,
"startColumn": 26,
"endColumn": 35
},
"contextRegion": {
"startLine": 4,
"endLine": 8,
"snippet": {
"text": "int main(){\n const char * filename1 = do_getenv();\n FILE * file1 = fopen(filename1, \"r\");\n}\n\n"
}
}
}
}],
"partialFingerprints": {
"primaryLocationLineHash": "6f35e497d744c2f6:1",
"primaryLocationStartColumnFingerprint": "21"
},
"relatedLocations": [{
"id": 1,
"physicalLocation": {
"artifactLocation": {
"uri": "f_open_test_0.cpp",
"uriBaseId": "%SRCROOT%",
"index": 1
},
"region": {
"startLine": 6,
"startColumn": 12,
"endColumn": 18
},
"contextRegion": {
"startLine": 4,
"endLine": 7,
"snippet": {
"text": "\nconst char * do_getenv1(const char * name) {\n return getenv(name);\n}\n"
}
}
},
"message": {
"text": "call to 'getenv'"
}
}]
}],
"columnKind": "utf16CodeUnits",
"properties": {
"semmle.formatSpecifier": "sarif-latest"
}
}]
```

Start by reproducing the example with f_open_test_0.cpp, f_open_test_a.cpp, and f_open_test_b.cpp using fopen-flow-from-getenv.ql, then inspect the generated SARIF result and its relatedLocations entry. Determine whether the expected function call chain is represented in the result and document the behavior or missing change.

Written by the indexing model from the issue text.