📖 Remove Alibaba and Baidu Cloud from providers list

[oscr]

What this PR does / why we need it:

Removes two seemingly abandoned providers as discussed in issue #6714

[k8s-ci-robot]

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[fabriziopandini]

/hold
Let's ping maintainer for those projects and give them 1 or two weeks to reply
Also before dropping some providers it will be great to formalize criteria we are applying/get community agreement

[oscr]

oam-oss/cluster-api-provider-alicloud#1

[killianmuldoon]

/ok-to-test

[vincepri]

/approve
/lgtm

[vincepri]

/hold cancel

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: vincepri

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[sbueringer]

/cherry-pick release-1.2

[k8s-infra-cherrypick-robot]

@sbueringer: once the present PR merges, I will cherry-pick it on top of release-1.2 in a new PR and assign it to you.

In response to this:

/cherry-pick release-1.2

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[k8s-infra-cherrypick-robot]

@sbueringer: new pull request created: #6814

In response to this:

/cherry-pick release-1.2

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