chore(test,ci): fix broken e2e test execution

[ScrewTSW]

What does this PR do?

• Fixes missing playwright dependencies installation

Screenshot/screencast of this PR

What issues does this PR fix or reference?

#4983
#5032

How to test this PR?

• yarn --frozen-lockfile
• yarn run test:e2e:smoke

[jeffmaury]

LGTM

[benoitf]

it only needs to be done once, so it should not be done at each run of the test command

[odockal]

@benoitf It does not force overwrite the artifacts, so if it is called twice, it does not do anything if already up to date.
Before it was part of yarn install, now it would be part of yarn test:e2e:XXX, which is truly called more than once when running tests, but it is better, imho, than adding this steps to the every workflow.

[benoitf]

so if it is called twice, it does not do anything if already up to date
yes but it's still not something that we should do there

move it to postinstall where it means it should be only done 'once' when dependencies are updated/changed

[odockal]

@benoitf Nice, neat.

[odockal]

It is all messy. I have created new issue that this PR directly addresses. It is #5032.
#4983 which I though was to be addressed by this PR will probably not be fixed by this.