fix: DockerFile security analysis warning - JS

[BruceHaley]

Fixes #minor

Description

The warning:
##[warning]Container security analysis found 1 violations. This repo has one or more docker files having references to images from external registries.

Example: E2E_BF-Streaming-DL-ASE_Test

Specific Changes

Change the FROM in .gitpod.Dockerfile to reference the appropriate container image in the Microsoft Artifact Registry.

[coveralls]

Pull Request Test Coverage Report for Build 2505564343

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+1.07%) to 84.482%

---

Files with Coverage Reduction	New Missed Lines	%
libraries/botbuilder-lg/src/templateExtensions.ts	1	84.48%

Totals
Change from base Build 2505148109:	1.07%
Covered Lines:	19904
Relevant Lines:	22312

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💛 - Coveralls