exoscale provider: migrate to exoscale API v2

[kobajagi]

Description

This PR reworks exoscale provider to use new exoscale API v2.

Guide updated and tested.

Checklist

• [x] Unit tests updated
• [x] End user documentation updated

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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/lifecycle stale

[kobajagi]

/remove-lifecycle stale

[kobajagi]

@Raffo @njuettner @seanmalloy @szuecs Anything i can do to help with merging this?

[llambiel]

@Raffo @njuettner @seanmalloy @szuecs Anything i can do to help with merging this?

This PR is 1 year old and we are about to decommission our API V1, effectively breaking this feature in its current state.

Anything we can do to help moving it forward ?

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kobajagi, szuecs

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The pull request process is described here

Needs approval from an approver in each of these files:

• ~~OWNERS~~ [szuecs]

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[kobajagi]

Rebased the branch. Let me know if there is anything else I should do.

[kobajagi]

I cannot rebase my PR due to #3789

[johngmyers]

#3789 is fixed

[kobajagi]

Thanks @johngmyers PR is rebased, @szuecs let me know when this can be merged.

[johngmyers]

/label tide/merge-method-squash

[johngmyers]

/lgtm