impossible to download artifacts that are not json-formated

[gdemengin]

get_build_artifact allows to get artifacts if they are JSON files
but if they are non-json ascii files or binary files it fails

for example run this pipeline:

```
node {
    sh '''
        echo text > ascii.txt
        dd if=/dev/zero of=binary.dat bs=1c count=10
        ls -l
        cat ascii.txt
        cat binary.dat | hexdump
    '''
    writeJSON file: 'data.json', json: [ 'key': 'val']
    archiveArtifacts 'ascii.txt'
    archiveArtifacts 'binary.dat'
    archiveArtifacts 'data.json'

}
```

json artifact can be downloaded

```
>>> import jenkins
>>> j = jenkins.Jenkins('http://ci.jenkins.internal:8080/', 'jenkins', 'jenkins')
>>> data = j.get_build_artifact('testjob', '1', 'data.json')
>>> print(data)
{'key': 'val'}
```

but not the binary one

```
>>> binary = j.get_build_artifact('testjob', '1', 'binary.dat')
Traceback (most recent call last):
  File "/workspace/python-jenkins/jenkins/__init__.py", line 731, in get_build_artifact
    return json.loads(response)
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/json/__init__.py", line 357, in loads
    return _default_decoder.decode(s)
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/json/decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/json/decoder.py", line 355, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/workspace/python-jenkins/jenkins/__init__.py", line 737, in get_build_artifact
    raise JenkinsException(
jenkins.JenkinsException: Could not parse JSON info for job[testjob] number[1]
```

nor the ascii (non-jenkins) one

```
>>> ascii = j.get_build_artifact('testjob', '1', 'ascii.txt')
Traceback (most recent call last):
  File "/workspace/python-jenkins/jenkins/__init__.py", line 731, in get_build_artifact
    return json.loads(response)
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/json/__init__.py", line 357, in loads
    return _default_decoder.decode(s)
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/json/decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/json/decoder.py", line 355, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/workspace/python-jenkins/jenkins/__init__.py", line 737, in get_build_artifact
    raise JenkinsException(
jenkins.JenkinsException: Could not parse JSON info for job[testjob] number[1]
``

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/jjb/python-jenkins/+/841640

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/jjb/python-jenkins/+/841640
Committed: https://opendev.org/jjb/python-jenkins/commit/5c44d7c9ecc6d8e92a935ac7b3a0262016d6ebb0
Submitter: "Zuul (22348)"
Branch: master

commit 5c44d7c9ecc6d8e92a935ac7b3a0262016d6ebb0
Author: Guillaume DeMengin <email address hidden>
Date: Sat Nov 26 19:35:37 2022 +0100

    get_build_artifact_as_bytes to support non-json files

    new function get_build_artifact_as_bytes to replace get_build_artifact (incompatible with artifacts not json-formatted)
    + use a stream to download binary artifacts

    all artifacts are returned as bytes to avoid encoding issues
    and an exception NotFoundException is raised in case of missing artifact

    Closes-Bug: #1973243
    Change-Id: I24ce4ecd854f8a19ed4d760404adb7d1ac6b5509