Simplified fetching of git tags

[sarakthon]

Ticket: ENT-13778

[olehermanse]

@sarakthon is this necessary?

[sarakthon]

When I generate the files without the else-block, a lot of the tags are not included, for example in the nova repository these tags are lost:

  "3.12.0-3756": "569a47940a899323762bb344590a6a8bd45e9bca",
  ...
  "2.2.3": "7425acab5d3746bd19f684d3da7ab48af3cb42fd",
  ...
  "2.1.4": "6c164868706b031bb7cf922388db754088a72d79",
  "2.1.3": "3bfb08ae8c335cebfce75c50b7269626b2519a27",
  "2.1.2": "c3f7f0a69082d9c3c539cdb203c36fa2f223d124",
  "2.1.1": "c15d6957e8ec4719699b5b65c9c1897712756eff",
  "2.1.0": "7648a05e1983b8beb2f71dea01f0f18965eeb681",
  "2.0.4": "f5c9b2893fd49027e6e03423650c834099c2a35f",
  "2.0.3": "05824b1769879d6f506e30e8a2847d4886477c70",
  "2.0.2": "3741ac8a615bbfdee572db065d616ac618eff860",
  "2.0.1": "eaebfe66e3bfb348fe22f6898bb4382387b717c8",
  "2.0.0": "bf89f831fb94a0af815014f61eb1bddead337a57",
  "1.1.2": "a503ebb250162b015e115e92d258517b0f75538e",
  "1.1.1": "f6150803b45cd0fe519a918f34e34753bcafdba2",
  "1.1.0": "b8d8ccaa05c0c66f1970a7de8a8a8e98c9ec6b80"
}

I tried looking into these tags and when I print them, none of them end with ^{}:

1.1.0
1.1.1
1.1.2
2.0.0
2.0.1
2.0.2
2.0.3
2.0.4
2.1.0
2.1.0b1
2.1.0p1
2.1.1
2.1.2
2.1.3
2.1.4
2.2.0
2.2.0^{}
2.2.1
2.2.1^{}
2.2.2
2.2.2^{}
2.2.3
2.2.4
2.2.4^{}

I also checked the tags manually on GitHub and this message appears:
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.

Does this mean I should not include them? Or should I include them in some other way?