FIX-#5042: Fix series __getitem__ with invalid strings.

[mvashishtha]

What do these changes do?

FIX-#5042: Fix the error message from series getitem for invalid strings.

• commit message follows format outlined here
• passes flake8 modin/ asv_bench/benchmarks scripts/doc_checker.py
• passes black --check modin/ asv_bench/benchmarks scripts/doc_checker.py
• signed commit with git commit -s
• Resolves BUG: series.__getitem__(invalid_string) raises UFuncTypeError instead of KeyError #5042
• tests added and passing
• module layout described at docs/development/architecture.rst is up-to-date
• added (Issue Number: PR title (PR Number)) and github username to release notes for next major release

[codecov]

Codecov Report

Merging #5048 (50b1614) into master (2d21561) will increase coverage by 4.70%.
The diff coverage is 84.61%.

❗ Current head 50b1614 differs from pull request most recent head 9953432. Consider uploading reports for the commit 9953432 to get more accurate results

@@            Coverage Diff             @@
##           master    #5048      +/-   ##
==========================================
+ Coverage   84.98%   89.69%   +4.70%     
==========================================
  Files         253      254       +1     
  Lines       19124    19410     +286     
==========================================
+ Hits        16253    17409    +1156     
+ Misses       2871     2001     -870     

Impacted Files	Coverage Δ
modin/pandas/series.py	94.53% <84.61%> (+0.49%)	⬆️
modin/logging/config.py	94.59% <0.00%> (-1.30%)	⬇️
modin/experimental/batch/test/test_pipeline.py	93.84% <0.00%> (ø)
modin/pandas/groupby.py	93.77% <0.00%> (+0.23%)	⬆️
modin/pandas/series_utils.py	98.89% <0.00%> (+0.55%)	⬆️
...odin/core/storage_formats/pandas/query_compiler.py	96.40% <0.00%> (+0.55%)	⬆️
modin/core/io/text/excel_dispatcher.py	94.01% <0.00%> (+0.85%)	⬆️
modin/core/io/column_stores/parquet_dispatcher.py	96.25% <0.00%> (+2.08%)	⬆️
...dataframe/pandas/partitioning/partition_manager.py	89.18% <0.00%> (+2.40%)	⬆️
... and 35 more

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[pyrito]

LGTM - thanks for the fix!

[vnlitvinov]

LGTM!