The scanner should populate the tool versions

[sschuberth]

Similar to like recently done for the analyzer, the scanner should also populate the toolVersions property when constructing the Environment:

ort/scanner/src/main/kotlin/Scanner.kt

Line 135 in eed3011

val scannerRun = ScannerRun(startTime, endTime, Environment(), configWithFilteredOptions, scanRecord)

ort/scanner/src/main/kotlin/LocalScanner.kt

Line 505 in eed3011

val scannerRun = ScannerRun(startTime, endTime, Environment(), scannerConfig, scanRecord)

(We should probably also check why it's necessary to create an Environment / ScannerRun at two places.)