refactor: Make backend search, backend tools and remainder backend files PEP8 compliant

[gaurarpit]

Purpose

• Make backend search, backend tools and remainder backend files PEP8 compliant
• Resolves #858

Does this introduce a breaking change?

• [ ] Yes
• [x] No

How to Test

• Get the code
• Run the tests:

  
  poetry run pytest -m "not azure and not functional"    
  poetry run pytest -m "functional"  

* Run the application locally and go to http://localhost:8502/Ingest_Data
* Verify all options work

![SCR-20240514-mdvv-2](https://github.com/Azure-Samples/chat-with-your-data-solution-accelerator/assets/4739534/3962e71a-c4aa-4b5a-ac0d-52b8ab9f195f)

![SCR-20240514-mdlu-2](https://github.com/Azure-Samples/chat-with-your-data-solution-accelerator/assets/4739534/bf0e0d86-18ed-4dbb-a61e-8c9bbeb7c7e3)

![SCR-20240514-mdof-2](https://github.com/Azure-Samples/chat-with-your-data-solution-accelerator/assets/4739534/79a9734e-4a28-4a92-9b12-6b433d1ce3c3)

![SCR-20240514-mdqf-2](https://github.com/Azure-Samples/chat-with-your-data-solution-accelerator/assets/4739534/22703e0d-ec06-4f62-b922-6548eeb2a367)

## What to Check

* Verify all options work

[github-actions[bot]]

Coverage Report •

File	Stmts	Miss	Cover	Missing
code/backend
admin.py	21	21	0%	1–5, 7, 9–10, 12, 15–16, 18–19, 22, 29, 36, 39–41, 43, 45
code/backend/batch
add_url_embeddings.py	47	0	100%
batch_push_results.py	25	0	100%
batch_start_processing.py	26	0	100%
function_app.py	16	16	0%	1–8, 10, 12–13, 15, 18–21
get_conversation_response.py	32	0	100%
code/backend/batch/utilities/common
answer.py	24	1	95%	39
source_document.py	60	5	91%	44, 47, 51, 55, 128
code/backend/batch/utilities/document_chunking
document_chunking_base.py	10	2	80%	10, 16
fixed_size_overlap.py	19	0	100%
layout.py	19	0	100%
page.py	17	0	100%
paragraph.py	9	2	77%	9, 15
code/backend/batch/utilities/document_loading
document_loading_base.py	9	1	88%	13
layout.py	12	5	58%	9, 12–13, 16, 25
read.py	12	5	58%	9, 12–13, 16, 25
web.py	19	1	94%	23
word_document.py	25	13	48%	11–12, 22–24, 27, 30, 33–37, 45
code/backend/batch/utilities/helpers/embedders
integrated_vectorization_embedder.py	36	4	88%	20, 39–41
push_embedder.py	46	0	100%
code/backend/batch/utilities/integrated_vectorization
azure_search_datasource.py	19	0	100%
azure_search_index.py	35	0	100%
azure_search_indexer.py	23	0	100%
azure_search_skillset.py	22	0	100%
code/backend/batch/utilities/loggers
conversation_logger.py	36	28	22%	8, 11–12, 15–24, 27–30, 33–42, 46
code/backend/batch/utilities/orchestrator
lang_chain_agent.py	60	19	68%	21–24, 26, 61–62, 82–85, 102–103, 106–109, 116–117
open_ai_functions.py	54	36	33%	62, 64, 70–73, 75, 78, 85–89, 93–94, 96, 102–106, 110–112, 115, 118–119, 122, 127–129, 132–134, 137, 142
orchestrator_base.py	50	8	84%	33, 72–74, 81–83, 93
semantic_kernel.py	54	0	100%
code/backend/batch/utilities/parser
output_parser_tool.py	39	0	100%
parser_base.py	9	2	77%	9, 19
code/backend/batch/utilities/plugins
chat_plugin.py	15	0	100%
post_answering_plugin.py	8	0	100%
code/backend/batch/utilities/search
azure_search_handler.py	58	2	96%	24, 30
integrated_vectorization_search_handler.py	61	3	95%	35, 111, 120
search.py	13	1	92%	15
search_handler_base.py	36	13	63%	13–15, 18–20, 24, 28, 32, 36, 40, 44, 48
code/backend/batch/utilities/tools
answer_processing_base.py	8	2	75%	8, 12
answering_tool_base.py	9	2	77%	9, 15
content_safety_checker.py	41	25	39%	16, 18–19, 24, 30–32, 35–36, 42–43, 49–54, 57–59, 61, 65–67, 69
post_prompt_tool.py	22	13	40%	11, 14–15, 17–18, 22, 29, 36–37, 45, 51–52, 60
question_answer_tool.py	61	0	100%
text_processing_tool.py	16	9	43%	9, 12–15, 21, 23, 30, 37
code/backend/pages
02_Explore_Data.py	26	26	0%	1–7, 9–10, 12, 18, 25, 28, 36, 38–39, 41–44, 46–49, 52–53
03_Delete_Data.py	36	36	0%	1–7, 9–11, 13, 19, 26, 29, 37, 39–40, 42–45, 47, 49–50, 54, 58–62, 64, 67–68, 70–72
TOTAL	2312	673	70%

Tests	Skipped	Failures	Errors	Time
183	0 :zzz:	0 :x:	0 :fire:	13.498s :stopwatch: