feat(cli): mark sync-v2 parameters as safe and deprecate --x-* ones

[jansegre]

Motivation

On the previous release sync-v2 was available as "experimental" and was marked as "unsafe", our tests showed it ran really well, so in this release it is being marked as "safe", making it more user friendly to enable.

Acceptance Criteria

• --x-sync-v2-only and --x-sync-bridge are still accepted but give a warning saying they're deprecated and will be removed in a later release (possibly v0.60.0)
• --sync-v2-only and --sync-bridge are added and have the same meaning as the --x-* variants.
  • internally they are mutually exclusive flags also with the --x-* variants, meaning --x-sync-v2-only and --sync-v2-only can't be used at the same time, and as long as one of them is true, the value used is true

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d01aecc) 85.32% compared to head (94696f2) 85.42%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #935      +/-   ##
==========================================
+ Coverage   85.32%   85.42%   +0.10%     
==========================================
  Files         290      290              
  Lines       22454    22460       +6     
  Branches     3377     3379       +2     
==========================================
+ Hits        19158    19186      +28     
+ Misses       2624     2609      -15     
+ Partials      672      665       -7     

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