Add missing github & gitlab reportfile options

[koenhendriks]

Type: bugfix / feature
Fix #977
Breaking change: no

The new supported reports for gitlab and github are missing from the --reportfile- Command line option. I found this issue when I wanted to report using ansi in the command line and export a report file for gitlab's CI. This is useful for end-users as the CI shows a nice report using ansi and the artifact generated by the --reportfile can be parsed by Github/Gitlab

This MR fixes the missing --report-file option for both gitlab and github.

Before MR:

phpmd app,tests ansi ./phpmd-ruleset.xml --reportfile-github report-github.json --reportfile-gitlab report-gitlab.json

No report-github.json or report-gitlab.json was created.

After MR:

phpmd app,tests ansi ./phpmd-ruleset.xml --reportfile-github report-github.json --reportfile-gitlab report-gitlab.json

report-gitlab.json is created with gitlab as report render.
report-github.json is created with github as report render.

[codecov-commenter]

Codecov Report

Merging #978 (643be6e) into master (eaa8e47) will decrease coverage by 0.06%.
The diff coverage is 33.33%.

@@             Coverage Diff              @@
##             master     #978      +/-   ##
============================================
- Coverage     88.65%   88.58%   -0.07%     
- Complexity     1055     1057       +2     
============================================
  Files            95       95              
  Lines          2661     2663       +2     
============================================
  Hits           2359     2359              
- Misses          302      304       +2     

Impacted Files	Coverage Δ
src/main/php/PHPMD/TextUI/CommandLineOptions.php	71.42% <33.33%> (-0.67%)	⬇️

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