build: add dependabot for e2e module

[qweeah]

What this PR does / why we need it:
This added dependabot config for nest e2e test module.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #876

Please check the following list:

• Does the affected code have corresponding tests, e.g. unit test, E2E test?
• Does this change require a documentation update?
• Does this introduce breaking changes that would require an announcement or bumping the major version?
• Do all new files have an appropriate license header?

[codecov-commenter]

Codecov Report

Merging #958 (c88b207) into main (b6fbe97) will not change coverage.
The diff coverage is n/a.

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@@           Coverage Diff           @@
##             main     #958   +/-   ##
=======================================
  Coverage   81.01%   81.01%           
=======================================
  Files          53       53           
  Lines        2776     2776           
=======================================
  Hits         2249     2249           
  Misses        358      358           
  Partials      169      169           

[shizhMSFT]

LGTM