fix(internal/ext): add 1.1 to versions and validate explicit 1.2

[GeorgeMac]

A user reported a couple issues which this PR addresses.

1. file state format 1.1 was being reported as "unsupported"

2023-08-23T12:09:26Z   FATAL   execute {"error": "unsupported version: 1.1"}

2. when explicitly setting to 1.2 it also produced errors

/opt/flags $ /flipt validate tmp.yaml
Validation failed!

- Message  : version: 2 errors in empty disjunction:
  File     : tmp.yaml
  Line     : 0
  Column   : 0

- Message  : version: conflicting values "1.0" and "1.2"
  File     : tmp.yaml
  Line     : 3
  Column   : 11

- Message  : version: conflicting values "1.1" and "1.2"
  File     : tmp.yaml
  Line     : 3
  Column   : 11

- Message  : flags.0._version: 2 errors in empty disjunction:
  File     : tmp.yaml
  Line     : 16
  Column   : 5

- Message  : flags.0._version: conflicting values "1.0" and "1.2"
  File     : tmp.yaml
  Line     : 4
  Column   : 24

- Message  : flags.0._version: conflicting values "1.1" and "1.2"
  File     : tmp.yaml
  Line     : 4
  Column   : 24

- Message  : flags.0.type: field not allowed
  File     : tmp.yaml
  Line     : 17
  Column   : 3

This was due to a couple issues.

1. We never retained version 1.1 in the supported versions lists in internal/ext.
2. We never added the new version 1.2 to the validation of the CUE schema.

We will add some better regression testing in a later PR.
For now I have attempted to improve the unit tests in these packages with more of the missing cases.

[yquansah]

LG

[markphelps]

lgtm! lets rebase onto release/1.25 branch and we can get a patch release out

[codecov]

Codecov Report

Merging #2042 (176f551) into main (e40c17e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2042   +/-   ##
=======================================
  Coverage   70.62%   70.62%           
=======================================
  Files          72       72           
  Lines        6821     6821           
=======================================
  Hits         4817     4817           
  Misses       1733     1733           
  Partials      271      271           

Files Changed	Coverage Δ
internal/ext/exporter.go	85.47% <ø> (ø)

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