Switch to new cluster endpoints without seed param

[maciaszczykm]

What this PR does / why we need it:

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Related to #2438

Special notes for your reviewer:

Release note:

Switched to new cluster endpoints.

[kubermatic-bot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[kubermatic-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: maciaszczykm

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

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [maciaszczykm]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[maciaszczykm]

/assign @floreks

[codecov]

Codecov Report

Merging #2641 into master will increase coverage by 0.01%.
The diff coverage is 12.82%.

@@            Coverage Diff             @@
##           master    #2641      +/-   ##
==========================================
+ Coverage   52.47%   52.48%   +0.01%     
==========================================
  Files         234      234              
  Lines        8191     8189       -2     
  Branches      998      986      -12     
==========================================
  Hits         4298     4298              
+ Misses       3890     3888       -2     
  Partials        3        3              

Impacted Files	Coverage Δ
...d-machine-network/add-machine-network.component.ts	61.90% <0.00%> (-0.89%)	⬇️
...firmation/cluster-delete-confirmation.component.ts	93.10% <ø> (ø)
...uster/cluster-details/cluster-details.component.ts	53.80% <ø> (ø)
...nt-details/machine-deployment-details.component.ts	40.17% <ø> (ø)
...orks-display/machine-networks-display.component.ts	42.85% <ø> (+1.94%)	⬆️
src/app/core/services/cluster/cluster.service.ts	17.85% <0.00%> (ø)
...app/core/services/page-title/page-title.service.ts	22.95% <6.25%> (+1.41%)	⬆️
src/app/core/services/params/params.service.ts	50.00% <20.00%> (-4.17%)	⬇️
...luster-version/change-cluster-version.component.ts	97.77% <100.00%> (ø)
...ter-details/edit-cluster/edit-cluster.component.ts	86.56% <100.00%> (ø)
... and 1 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 85bfe10...6ce5fb7. Read the comment docs.

[maciaszczykm]

/hold

[maciaszczykm]

/hold cancel

[floreks]

/lgtm

[kubermatic-bot]

LGTM label has been added.

Git tree hash: 7f6460df03f71d7529a450eadfc35ab73f5d7ff5