Add partition number annotation

[mohamed-rafraf]

What this PR does / why we need it:

Add support for specifying the main partition number for OS installation in bare-metal servers via the
hardware.kubermatic.io/partition-number annotation in Tinkerbell Hardware Objects.

Which issue(s) this PR fixes:

Fixes #

What type of PR is this?

/kind feature

Special notes for your reviewer:

Does this PR introduce a user-facing change? Then add your Release Note here:

Support added for specifying the main OS partition number in baremetal provider machines using the `hardware.kubermatic.io/partition-number` annotation.

Documentation:

NONE

[mohamed-rafraf]

/assign
/cc @moadqassem @ahmedwaleedmalik

[ahmedwaleedmalik]

/approve

[kubermatic-bot]

LGTM label has been added.

Git tree hash: 2c2a155b174e546407089f8f492a41bbe7c1299c

[kubermatic-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahmedwaleedmalik

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• OWNERS [ahmedwaleedmalik]

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[mohamed-rafraf]

/cherrypick release/v1.60

[kubermatic-bot]

@mohamed-rafraf: new pull request created: #1892

In response to this:

/cherrypick release/v1.60

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