impr: CallerInfo should print full paths to the terminal

I am proposing this simple change, which changes this output
```
--- FAIL: TestABC (0.00s)
    --- FAIL: TestABC/C (0.00s)
        /0/1/2/3/4/5/6_test.go:258:
            	Error Trace:	6_test.go:258
            	            				6_test.go:748
            	Error:      	Not equal:
...
```
to this:
```
--- FAIL: TestABC (0.00s)
    --- FAIL: TestABC/C (0.00s)
        /0/1/2/3/4/5/6_test.go:258:
            	Error Trace:	/0/1/2/3/4/5/6_test.go:258
            	            				/0/1/2/3/4/5/6_test.go:748
            	Error:      	Not equal:
...
```

With the latter output, it is much more straightforward to find the file
you are looking for, even though in the displayed case, the file is the same.

However, for VSCodium, the case is a little more helpful, since VSCodium's
terminal is smart enough to recognize the output, and make links out of that input.

Signed-off-by: Stavros Ntentos <133706+stdedos@users.noreply.github.com>

assert/assertions.go

@@ -8,6 +8,7 @@ import (
 	"fmt"
 	"math"
 	"os"
+	"path/filepath"
 	"reflect"
 	"regexp"
 	"runtime"
@@ -144,7 +145,8 @@ func CallerInfo() []string {
 		if len(parts) > 1 {
 			dir := parts[len(parts)-2]
 			if (dir != "assert" && dir != "mock" && dir != "require") || file == "mock_test.go" {
-				callers = append(callers, fmt.Sprintf("%s:%d", file, line))
+				path, _ := filepath.Abs(file)
+				callers = append(callers, fmt.Sprintf("%s:%d", path, line))
 			}
 		}