init MavenImplicitProjectRepository again to fix resolving M2E Maven projects in non-bnd-workspaces

[chrisrueger]

Fixes #6393
in 7.0.0 LaunchUtils.createRun() was called which is responsible for creating an instance of MavenImplicitProjectRepository which is required for resolving bndrun in an m2e project. but it was removed in 7.1.0 for some reason. So in 7.1.0 MavenImplicitProjectRepository was never initialized, which seems to be the reason that the Maven Repositories which are show in the Repository Browser are not seen by the BndRunResolveContext.

With this PR resolving the reproducer from #6393 works again.

@pkriens I am not 100% what other effects this change might have. I just noticed the difference between 7.1.0 and 7.0.0.
and try to bring back the code from 7.0.0. Please have a look if this makes sense, or if some other logic is required.
In my test it went into the if-branch which calls LaunchUtils.createRun(inputResource, RunMode.EDIT); (instead of Bndrun.createBndrun(workspace, this.inputFile);) and then resolving worked again (as per expected behavior in #6393

7.0.0.:

bnd/bndtools.core/src/bndtools/editor/BndEditor.java

Line 617 in b82dc86

if (inputResource != null) {

7.1.0:

bnd/bndtools.core/src/bndtools/editor/BndEditor.java

Line 622 in f9b2c85

Bndrun bndrun = Bndrun.createBndrun(workspace, inputFile);

[pkriens]

I think this is superseded by #6401