File encoding checks fail with uchardet when the file already is UTF-8

[Zharktas]

Describe the bug
uchardet says that the file is UTF-8 file but datapusher still tries to re-encode it

To Reproduce

Example file https://www.avoindata.fi/data/dataset/4b64be55-5a69-4f6b-a9d5-d4cbbe5c4382/resource/6409bdec-4a48-46a9-8729-5a727e37cd55/download/data.csv

Upload it to to datapusher, log says the following:

Fetching from: http://localhost/data/fi/dataset/3180686e-5a17-4b83-8d93-8a3cc954fccd/resource/bdcf31b0-3c90-46e7-8b56-94a6ad1f897f/download/test_data.csv...
File format: CSV
Downloading 52.99MB file...
Fetched 52.99MB file in 0.67 seconds.
ANALYZING WITH QSV..
Normalizing/UTF-8 transcoding CSV...
Identified encoding of the file: UTF-8

File is not UTF-8 encoded. Re-encoding from UTF-8
 to UTF-8

iconv: source charset UTF-8
Invalid argument
Job aborted as the file cannot be re-encoded to UTF-8: Command '['iconv', '-f', 'UTF-8\n', '-t', 'UTF-8', '/tmp/tmpr35v1f3a/tmp.CSV', '--output', '/tmp/tmpr35v1f3a/qsv_input_utf_8_encoded.csv']' returned non-zero exit status 1.

it appears to be failing here:

datapusher-plus/datapusher/jobs.py

Line 683 in 2c648b2

if file_encoding.stdout != "UTF-8":

[Zharktas]

running uchardet actually produces line ending in to the variable and the check fails, in my testing the file_encoding.stdout contains UTF-8\n