build(plugin-keychain-memory): fix local imports broken due to .js exts

[petermetz]

Found the solution and a long discussion about it here:
kulshekhar/ts-jest#1057

TLDR: The Jest resolver needs a little extra information/tweak to the
config so that it can correctly handle the .js imports.

Specifically this comment provided the solution which I made here:
kulshekhar/ts-jest#1057 (comment)

Fixes #3254

Signed-off-by: Peter Somogyvari peter.somogyvari@accenture.com

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A Must Read for Beginners
For rebasing and squashing, here's a must read guide for beginners.

[sandeepnRES]

Hi @petermetz yarn-codegen test is failing. As it is a required test, hence I approved the PR, as it is already blocking the PR.

[petermetz]

Hi @petermetz yarn-codegen test is failing. As it is a required test, hence I approved the PR, as it is already blocking the PR.

@sandeepnRES Thank you for the review! I'm retrying the codegen task now (it's the old flake that has returned so it usually just needs another go, fingers crossed)