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### Summary
Currently, the email partitioner removes only `=\n` characters during
the clearing process. However, email content sometimes contains `=\r\n`
characters, especially when read from file-like objects such as
`SpooledTemporaryFile` (the file type used in our API). This PR updates
the email partitioner to remove both `=\n` and `=\r\n` characters during
the clearing process.
### Testing
```
filename = "example-docs/eml/family-day.eml"
elements = partition_email(
filename=filename,
)
print(f"From filename: {elements[3].text}")
with open(filename, "rb") as test_file:
spooled_temp_file = tempfile.SpooledTemporaryFile()
spooled_temp_file.write(test_file.read())
spooled_temp_file.seek(0)
elements = partition_email(file=spooled_temp_file)
print(f"From spooled_temp_file: {elements[3].text}")
```
**Results:**
- on `main`
```
From filename: Make sure to RSVP!
From spooled_temp_file: Make sure to = RSVP!
```
- on `PR`
```
From filename: Make sure to RSVP!
From spooled_temp_file: Make sure to RSVP!
```