feat(server): deprecate datacenter column

[phm07]

This marks the datacenter column for hcloud server list as deprecated and outputs a warning if it is used.
Note: Even though Primary IPs have the datacenter property as well, the column is entirely missing in hcloud primary-ip list.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.47%. Comparing base (d5c690f) to head (2b5a1e1).

Additional details and impacted files

@@                     Coverage Diff                      @@
##           table-column-deprecation    #1301      +/-   ##
============================================================
- Coverage                     72.48%   67.47%   -5.02%     
============================================================
  Files                           302      302              
  Lines                         11009    11009              
============================================================
- Hits                           7980     7428     -552     
- Misses                         2153     2655     +502     
- Partials                        876      926      +50     

Flag	Coverage Δ
e2e	?
unit	67.47% <ø> (ø)

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