fix: support archive.none for OSS directory artifacts

[jibuji]

to fix problem: #6293
I have used the following workflow to test, and the result is correct.

apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  name: test-archive-none
spec:
  entrypoint: oss-getter-and-uploader
  templates:
  - name: oss-getter-and-uploader
    inputs:
      artifacts:
      - name: oss-none-empty-dir
        path: "/mnt/input/none-empty"
        oss:
          key: "some/none-empty"
        archive:
          none: {}
      - name: oss-empty-dir
        path: "/mnt/input/empty-dir"
        oss:
          key: "some/emptydir"
        archive:
          none: {}
      - name: oss-file
        path: "/mnt/input/file"
        oss:
          key: "some/file"
        archive:
          none: {}
      - name: oss-3level
        path: "/mnt/input/3level"
        oss:
          key: "some/3level-dir"
        archive:
          none: {}
    container:
      image: 'alpine:latest'
      command: ['/bin/sh', '-c']
      args: ["cp -rf /mnt/input /mnt/output"]
      volumeMounts:
        - name: out
          mountPath: /mnt
    volumes:
      - name: out
        emptyDir: { }
    outputs:
      artifacts:
      - name: oss-none-empty-dir
        path: "/mnt/output/none-empty"
        oss:
          key: "some2/none-empty"
        archive:
          none: {}
      - name: oss-empty-dir
        path: "/mnt/output/empty-dir"
        oss:
          key: "some2/emptydir"
        archive:
          none: {}
      - name: oss-file
        path: "/mnt/output/file"
        oss:
          key: "some2/file"
        archive:
          none: {}
      - name: oss-3level
        path: "/mnt/output/3level"
        oss:
          key: "some2/3level-dir"
        archive:
          none: {}

Thanks to @terrytangyuan a lot. He helped me to rectify some code, but I failed to commit the PR because my mistake. So, I open this one and commits again.

[terrytangyuan]

Original review feedback is in #6296

[terrytangyuan]

LGTM. All feedback in previous review have been addressed.

[jibuji]

Thanks. What should I do next? This is my first time to contribute.

[terrytangyuan]

Let's wait for one of the approvers to take another look for any additional feedback before merging.

[codecov]

Codecov Report

Merging #6312 (aaa7c16) into master (c2360c4) will increase coverage by 1.10%.
The diff coverage is 39.21%.

❗ Current head aaa7c16 differs from pull request most recent head 9b2d7fc. Consider uploading reports for the commit 9b2d7fc to get more accurate results

@@            Coverage Diff             @@
##           master    #6312      +/-   ##
==========================================
+ Coverage   47.84%   48.95%   +1.10%     
==========================================
  Files         250      252       +2     
  Lines       15667    18044    +2377     
==========================================
+ Hits         7496     8833    +1337     
- Misses       7232     8243    +1011     
- Partials      939      968      +29     

Impacted Files	Coverage Δ
config/config.go	31.57% <ø> (-39.26%)	⬇️
pkg/apis/workflow/v1alpha1/workflow_types.go	49.82% <ø> (+0.20%)	⬆️
server/auth/sso/sso.go	25.90% <0.00%> (-0.90%)	⬇️
util/kubeconfig/kubeconfig.go	25.19% <0.00%> (+3.76%)	⬆️
util/kubeconfig/roundtripper.go	0.00% <0.00%> (ø)
workflow/artifacts/oss/oss.go	3.92% <0.00%> (-1.69%)	⬇️
workflow/common/common.go	80.00% <ø> (+5.00%)	⬆️
workflow/metrics/metrics.go	76.11% <0.00%> (-4.47%)	⬇️
workflow/util/merge.go	61.53% <0.00%> (+2.44%)	⬆️
workflow/cron/operator.go	38.35% <50.00%> (+0.98%)	⬆️
... and 254 more

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[sarabala1979]

@jibuji PR looks good. can you add a test?