fix(material/datepicker): fix date picker shortcuts

[sasidharansd]

Fixes a bug in the Angular Material datepicker component where the datepicker should open/close only on alt+down and alt+up respectively but using shift + ctrl + alt + down or ctrl + alt + down the datepicker was opening, and same happens for closing the date picker added a condition to check if ctrl, shift or meta keys are present and if it is present restricting datepicker to not to open/close.

Fixes #25868

[mmalerba]

LGTM

[mmalerba]

@sasidharansd can you run yarn bazel run //tools/public_api_guard:cdk/keycodes.md_api.accept to approve the API change?

[sasidharansd]

@sasidharansd can you run yarn bazel run //tools/public_api_guard:cdk/keycodes.md_api.accept to approve the API change?

Done, I have ran the cmd and updated the PR.

[sasidharansd]

@mmalerba This is my first time contributing. Could you please help me to know. is there anything that I should be doing more or is everything done from my end and I should be wait for the pr to be reviewed ?

[mmalerba]

There is nothing to be done on your end for the moment. We need to run this against Google's internal tests and make sure everything passes. We'll reach out if there are issues

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