Work CD-CI
Work CD-CI

- Remove step to set cloud build number (build is shared among VS2017 and 2019 which have different versions).
- Change git tag to use VS version as prefix.
- Update step to push change log to fetch repo first otherwise it would fail because of the other build job has already pushed it's changes.

Signed-off-by: José Simões <1616ff7a83d123f98f8f38fa2524eab406644781@eclo.solutions>

nanoframework/nf-Visual-Studio-extension