Improve test coverage: CLI

[jsignell]

Related Issue(s):

• Increase test coverage #590

Description:

Tackling test coverage in the CLI. I found one bug, one confusing behavior, and one old deprecation.

After this PR:

---------- coverage: platform linux, python 3.11.6-final-0 -----------
Name                                 Stmts   Miss  Cover   Missing
------------------------------------------------------------------
pystac_client/__init__.py                7      0   100%
pystac_client/_utils.py                 11      0   100%
pystac_client/cli.py                   151      5    97%   100-101, 367-369
pystac_client/client.py                149     10    93%   45, 353, 356, 374-375, 405-408, 428
pystac_client/collection_client.py      80      8    90%   27-29, 97, 101, 108, 181, 193-194
pystac_client/conformance.py            29      3    90%   30, 35, 38
pystac_client/errors.py                  3      0   100%
pystac_client/exceptions.py             10      0   100%
pystac_client/item_search.py           367     21    94%   34, 46, 97-100, 128, 283, 292, 321, 366, 374, 395-397, 417, 514, 543, 550, 565, 574, 612, 676, 749
pystac_client/mixins.py                 37      2    95%   19, 52
pystac_client/stac_api_io.py           114     10    91%   36-37, 210, 213-215, 220-221, 225, 280
pystac_client/version.py                 1      0   100%
pystac_client/warnings.py               29      4    86%   92-96
------------------------------------------------------------------
TOTAL                                  988     63    94%

PR Checklist:

• Code is formatted
• Tests pass
• Changes are added to the CHANGELOG

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Files	Coverage Δ
pystac_client/cli.py	95.42% <100.00%> (+22.46%)	⬆️

... and 1 file with indirect coverage changes

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