CP-852 Make copy license task compatible with dart formatter

[evanweible-wf]

Dependent on #35.

Issue

The generated license headers for .dart files have trailing whitespace on empty lines, which the dart formatter picks up.
Fixes #36

Changes

Source:

• Update the copy license task to trim the right side of each line as it generates the license header so that the end result is deemed "clean" by the dart formatter.
• Also add some license headers that were missed.

Tests:

• n/a, tests aren't this fine grained yet

Areas of Regression

• Copy License task

Testing

• ddev test --integration passes
• Manual test:
  • delete a license header from one of the .dart files that has it
  • run ddev copy-license (should re-add that license header)
  • run ddev format --check (should report that the code is good to go!)

Code Review

@trentgrover-wf
@maxwellpeterson-wf
@dustinlessard-wf
@jayudey-wf

[maxwellpeterson-wf]

+1

[trentgrover-wf]

+1
@jayudey-wf ready for merge

[jayudey-wf]

QA Resource Approval: +10

• Testing instruction
• Dev +1's
• Dev/QA +10 with detail of what was tested
  • ran integration tests locally
  • removed license header and re-ran dartfmt to ensure no changes were made
• Unit test created/updated
• All unit tests pass

Merging into master.