Fix switch for sharing cluster

[pkprzekwas]

What this PR does / why we need it:
This PR changes the type of enableShareCluster to bool pointer in order to avoid defaulting this value to true each time settings are updated.

Which issue(s) this PR fixes:
Fixes #6329

What type of PR is this?
/kind bug

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

Fix `Enable Share Cluster` button in Admin Settings.

Documentation:

NONE

[Waseem826]

/approve

[kubermatic-bot]

LGTM label has been added.

Git tree hash: b7b343c185d325e0f107840d3cef11a6eb08d8ee

[kubermatic-bot]

LGTM label has been added.

Git tree hash: 70621cb2293ee9bcb9158f13797adeb1106b6a3e

[pkprzekwas]

/test pre-dashboard-api-unit

[pkprzekwas]

/test pre-dashboard-api-unit

[pkprzekwas]

/test pre-dashboard-api-unit

[kubermatic-bot]

LGTM label has been added.

Git tree hash: 51df4f1159ad019f5887511afa894d9e7a421553

[embik]

/cc @ahmedwaleedmalik

[ahmedwaleedmalik]

/approve

[kubermatic-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahmedwaleedmalik, Waseem826

The full list of commands accepted by this bot can be found here.

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Needs approval from an approver in each of these files:

• modules/api/OWNERS [ahmedwaleedmalik]
• modules/api/pkg/OWNERS [ahmedwaleedmalik]
• modules/api/pkg/api/OWNERS [ahmedwaleedmalik]
• modules/api/pkg/handler/OWNERS [ahmedwaleedmalik]
• modules/api/pkg/provider/kubernetes/OWNERS [ahmedwaleedmalik]

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[ahmedwaleedmalik]

cc @kubermatic/sig-release-managers

[embik]

/retest

[embik]

/retest

🤞🏻

[pkprzekwas]

/retest

[pkprzekwas]

/cherrypick release/v2.23

[kubermatic-bot]

@pkprzekwas: #6340 failed to apply on top of branch "release/v2.23":

Applying: Fix switch for sharing cluster
Using index info to reconstruct a base tree...
M	modules/api/go.mod
M	modules/api/go.sum
M	modules/api/pkg/api/v2/types.go
M	modules/api/pkg/handler/test/helper.go
M	modules/api/pkg/handler/v1/admin/settings.go
M	modules/api/pkg/test/e2e/utils/apiclient/models/global_settings.go
Falling back to patching base and 3-way merge...
Auto-merging modules/api/pkg/test/e2e/utils/apiclient/models/global_settings.go
Auto-merging modules/api/pkg/handler/v1/admin/settings.go
Auto-merging modules/api/pkg/handler/test/helper.go
Auto-merging modules/api/pkg/api/v2/types.go
Auto-merging modules/api/go.sum
CONFLICT (content): Merge conflict in modules/api/go.sum
Auto-merging modules/api/go.mod
CONFLICT (content): Merge conflict in modules/api/go.mod
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 Fix switch for sharing cluster
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

In response to this:

/cherrypick release/v2.23

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