build: update dependencies check to only check for runtime and compile scopes

[salehsquared]

Changes the dependencies.sh kokoro script to only compare 'compile' and 'runtime' scoped dependencies between the flattened POM and original POM.

This follows an issue recently noted within the java-bigquerystorage libraries in which inconsistent behavior with 'provided' scope transitive dependencies.

[stephaniewang526]

this should be renamed to be feat: update dependencies check to only check for runtime and compile scopes

update both subject and commit msg. To update commit msg run git rebase -i master and then when prompted, pick reword, modify commit msg, finally git push --force.

[stephaniewang526]

@saturnism @elharo this is for verifying flattened pom vs. original pom completeness

[stephaniewang526]

@chingor13 could you merge this one please?