Fix Greenhouse employee_id type

[remisalmon]

What

Fixes #11939

How

Change all Employee IDs type to string (currently some streams have employee_id as integer, some as string).

Recommended reading order

1. x.java
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

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[CLAassistant]

All committers have signed the CLA.

[marcosmarxm]

Thanks for the contribution @remisalmon can you sign the CLA?

[remisalmon]

Thanks for the contribution @remisalmon can you sign the CLA?

Done, thank you.

[marcosmarxm]

/test connector=connectors/source-greenhouse

🕑 connectors/source-greenhouse https://github.com/airbytehq/airbyte/actions/runs/2173693612
✅ connectors/source-greenhouse https://github.com/airbytehq/airbyte/actions/runs/2173693612
Python tests coverage:

Name                                                 Stmts   Miss  Cover
------------------------------------------------------------------------
source_acceptance_test/utils/__init__.py                 6      0   100%
source_acceptance_test/tests/__init__.py                 4      0   100%
source_acceptance_test/__init__.py                       2      0   100%
source_acceptance_test/tests/test_full_refresh.py       52      2    96%
source_acceptance_test/utils/asserts.py                 37      2    95%
source_acceptance_test/config.py                        74      6    92%
source_acceptance_test/utils/json_schema_helper.py     105     13    88%
source_acceptance_test/utils/common.py                  70     17    76%
source_acceptance_test/utils/compare.py                 62     23    63%
source_acceptance_test/tests/test_core.py              285    106    63%
source_acceptance_test/base.py                          10      4    60%
source_acceptance_test/utils/connector_runner.py       110     48    56%
source_acceptance_test/tests/test_incremental.py        69     38    45%
------------------------------------------------------------------------
TOTAL                                                  886    259    71%
Name                            Stmts   Miss  Cover
---------------------------------------------------
source_greenhouse/__init__.py       2      0   100%
source_greenhouse/streams.py       86     12    86%
source_greenhouse/source.py        20     10    50%
---------------------------------------------------
TOTAL                             108     22    80%

Python short test summary info:

=========================== short test summary info ============================
SKIPPED [1] ../usr/local/lib/python3.7/site-packages/source_acceptance_test/plugin.py:56: Skipping TestIncremental.test_two_sequential_reads because not found in the config
=================== 29 passed, 1 skipped in 67.43s (0:01:07) ===================

[marcosmarxm]

/publish connector=connectors/source-greenhouse auto-bump-version=false

🕑 connectors/source-greenhouse https://github.com/airbytehq/airbyte/actions/runs/2173746367
🚀 Successfully published connectors/source-greenhouse
✅ connectors/source-greenhouse https://github.com/airbytehq/airbyte/actions/runs/2173746367