Source Airtable: fix field names

[artem1205]

What

Resolving https://github.com/airbytehq/oncall/issues/1293

How

fix field names (clean them to lowercase)

Recommended reading order

2. y.python

🚨 User Impact 🚨

Are there any breaking changes? What is the end result perceived by the user? If yes, please merge this PR with the 🚨🚨 emoji so changelog authors can further highlight this if needed.

Pre-merge Checklist

Expand the relevant checklist and delete the others.

Updating a connector

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• Code reviews completed
• Documentation updated
  • Connector's README.md
  • Connector's bootstrap.md. See description and examples
  • Changelog updated in docs/integrations/<source or destination>/<name>.md including changelog. See changelog example
• PR name follows PR naming conventions

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• Build is successful
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• /test connector=connectors/<name> command is passing
• New Connector version released on Dockerhub and connector version bumped by running the /publish command described here

[alafanechere]

/test connector=connectors/source-airtable

🕑 connectors/source-airtable https://github.com/airbytehq/airbyte/actions/runs/3885999823
✅ connectors/source-airtable https://github.com/airbytehq/airbyte/actions/runs/3885999823
Python tests coverage:

Name                                Stmts   Miss  Cover
-------------------------------------------------------
source_airtable/schema_helpers.py      19      0   100%
source_airtable/__init__.py             2      0   100%
source_airtable/streams.py             92      1    99%
source_airtable/source.py              36      1    97%
-------------------------------------------------------
TOTAL                                 149      2    99%
	 Name                                                 Stmts   Miss  Cover   Missing
	 ----------------------------------------------------------------------------------
	 source_acceptance_test/base.py                          12      4    67%   16-19
	 source_acceptance_test/config.py                       141      5    96%   87, 93, 239, 243-244
	 source_acceptance_test/conftest.py                     211     95    55%   36, 42-44, 49, 54, 77, 83, 89-91, 110, 115-117, 123-125, 131-132, 137-138, 143, 149, 158-167, 173-178, 193, 217, 248, 254, 262-267, 275-285, 293-306, 311-317, 324-335, 342-358
	 source_acceptance_test/plugin.py                        69     25    64%   22-23, 31, 36, 120-140, 144-148
	 source_acceptance_test/tests/test_core.py              402    115    71%   53, 58, 93-104, 109-116, 120-121, 125-126, 308, 346-363, 376-387, 391-396, 402, 435-440, 478-485, 528-530, 533, 598-606, 618-621, 626, 682-683, 689, 692, 728-738, 751-776
	 source_acceptance_test/tests/test_incremental.py       160     14    91%   56-63, 68-81, 244
	 source_acceptance_test/utils/asserts.py                 39      2    95%   62-63
	 source_acceptance_test/utils/common.py                  94     10    89%   16-17, 32-38, 72, 75
	 source_acceptance_test/utils/compare.py                 62     23    63%   21-51, 68, 97-99
	 source_acceptance_test/utils/connector_runner.py       133     33    75%   24-27, 46-47, 50-54, 57-58, 73-75, 78-80, 83-85, 88-90, 93-95, 124-125, 159-161, 208
	 source_acceptance_test/utils/json_schema_helper.py     107     13    88%   30-31, 38, 41, 65-68, 96, 120, 192-194
	 ----------------------------------------------------------------------------------
	 TOTAL                                                 1609    339    79%

Build Passed

Test summary info:

=========================== short test summary info ============================
SKIPPED [1] ../usr/local/lib/python3.9/site-packages/source_acceptance_test/plugin.py:63: Skipping TestIncremental.test_two_sequential_reads: not found in the config.
SKIPPED [1] ../usr/local/lib/python3.9/site-packages/source_acceptance_test/tests/test_core.py:94: The previous and actual specifications are identical.
SKIPPED [1] ../usr/local/lib/python3.9/site-packages/source_acceptance_test/tests/test_core.py:377: The previous and actual discovered catalogs are identical.
======================== 26 passed, 3 skipped in 33.08s ========================

[alafanechere]

I'm trying to figure out why tests passed on #20846 without schema validation errors.

[alafanechere]

/publish connector=connectors/source-airtable

🕑 Publishing the following connectors:
connectors/source-airtable
https://github.com/airbytehq/airbyte/actions/runs/3886185581

Connector	Did it publish?	Were definitions generated?
connectors/source-airtable	✅	✅

if you have connectors that successfully published but failed definition generation, follow step 4 here ▶️