Remove duplicated upload to unused blob storage in publishReports

[lemeurherve]

Reproduction steps

1. Observe

   pipeline-library/vars/publishReports.groovy

   Lines 55 to 59 in 0d4b15d

   	// Blob container can be removed once files are uploaded on the azure file storage
   	sh 'az storage blob upload --account-name=prodjenkinsreports --container=reports --timeout=${TIMEOUT} --file=${FILENAME} --name=${FILENAME} ${UPLOADFLAGS} --overwrite'
   	// `az storage file upload` doesn't support file uploaded in a remote directory that doesn't exist but upload-batch yes. Unfortunately the cli syntax is a bit different and requires filename and directory name to be set differently.
   	sh 'az storage file upload-batch --account-name prodjenkinsreports --destination reports --source ${SOURCE_DIRNAME} --destination-path ${DESTINATION_PATH} --pattern ${PATTERN} ${UPLOADFLAGS}'

2. Notice the report is uploaded to both a blob storage and a file share (in the same prodjenkinsreports storage account).
3. Notice the file share is the only one publicly exposed for consumption: https://github.com/jenkins-infra/kubernetes-management/blob/04f400e202bde38e443817e51da1bc809a1a0d22/config/reports.yaml#L8-L26

Expected Results

Report is uploaded only to the file share.

Actual Results

Report is uploaded to both the blob storage and the file share.

Anything else?

An helpdesk issue to delete the blob storage should be open after that.