chore(model): Remove `IVY_VERSION_RANGE_INDICATORS`

[sschuberth]

These are by now only used for an early return from getVersionRange(). As checking for a valid range is done by the RangesListFactory, the only remaining case to check for is the empty string, which would otherwise create a ">= 0.0.0" range.

Note that as of 8142cdc the variable name was misleading anyway, as it does not only contain Ivy version range indicators.

[nnobelis]

Should this paragraph be changed too: https://github.com/oss-review-toolkit/ort/blob/0fdf6590f72b7e5f8e5a84ee69f8d9415bf4e8ed/website/docs/configuration/package-configurations.md?plain=1#L17-L19

[sschuberth]

Should this paragraph be changed too:

Done in a separate commit.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 56.72%. Comparing base (cd3bc07) to head (1527bed).

Files with missing lines	Patch %	Lines
...del/src/main/kotlin/config/PackageConfiguration.kt	0.00%	1 Missing :warning:
model/src/main/kotlin/utils/VersionUtils.kt	0.00%	1 Missing :warning:

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #10441      +/-   ##
============================================
- Coverage     56.74%   56.72%   -0.02%     
  Complexity     1640     1640              
============================================
  Files           337      337              
  Lines         12476    12475       -1     
  Branches       1177     1177              
============================================
- Hits           7079     7076       -3     
- Misses         4945     4947       +2     
  Partials        452      452              

Flag	Coverage Δ
funTest-non-docker	33.00% <0.00%> (+<0.01%)	:arrow_up:

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