chore(ci): install gulp globally

[Splaktar]

PR Checklist

Please check that your PR fulfills the following requirements:

• The commit message follows our guidelines
• Tests for the changes have been added or this is not a bug fix / enhancement
• Docs have been added, updated, or were not required

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Enhancement
[ ] Documentation content changes
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[x] CI related changes
[ ] Infrastructure changes
[ ] Other... Please describe:

What is the current behavior?

./scripts/circleci/update-snapshot-and-docs.sh --sha=${CIRCLE_SHA1}
-- Building release...
./scripts/bower-material-release.sh: line 12: gulp: command not found
Exited with code 127

Issue Number:
Relates to #11592. Relates to #11608.

What is the new behavior?

Install gulp globally in update_and_snapshot_docs job so that existing scripts will work.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information