Use the COS endpoint override when generating bootstrap ignition

[mjturek]

What this PR does / why we need it: When overridding the COS endpoint in the disconnected use case, we'll need to also grab ignition from the same endpoint. This PR uses the COS endpoint override when generating the ignition config for the bootstrap machine.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged): Fixes #

Special notes for your reviewer:

/area provider/ibmcloud

1. Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

Release note:

NONE

[linux-foundation-easycla[bot]]

The committers listed above are authorized under a signed CLA.

• :white_check_mark: login: mjturek / name: Mike Turek (560153e13841e6d757491da04e405afba4bccb80)

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[mjturek]

@Karthik-K-N @Prajyot-Parab please let me know what you think of this

[mkumatag]

@mjturek please sign the CLA by following the steps mentioned here - https://github.ibm.com/powercloud/container-dev/blob/master/squad-upstream-core.md#get-access-to-the-k8s-cla

[mkumatag]

/ok-to-test

[mjturek]

unfortunately Jeff is out this week so might not get CLA complete until next week

[mjturek]

@mkumatag CLA is complete

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mjturek, mkumatag

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/kubernetes-sigs/cluster-api-provider-ibmcloud/blob/main/OWNERS)~~ [mkumatag] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment