skip run app via clusterfile Or run CLI

[kakaZhou719]

Describe what this PR does / why we need it

for sealer run:

sealer run abc:v1 --apps "" : will skip
sealer run abc:v1 --apps "fake app" : will return error
sealer run abc:v1 --apps "real app": will launch 

for clusterfile: will skip launch app when appNames = [""]

apiVersion: sealer.io/v2
kind: Cluster
metadata:
  creationTimestamp: null
  name: my-cluster
spec:
  appNames: [""]
  hosts:
  - ips:
    - 172.16.26.165
    roles:
    - master
    ssh: {}
  image: localhost/abc:v1
  ssh:
    passwd: aaaaaa
    pk: /root/.ssh/id_rsa
    port: "22"
    user: root

Does this pull request fix one issue?

Describe how you did it

Describe how to verify it

Special notes for reviews

[starnop]

sealer run abc:v1 --apps "fake app" : will skip

return error?

[codecov-commenter]

Codecov Report

Patch coverage: 50.00% and no project coverage change.

Comparison is base (4ecebf3) 18.89% compared to head (2af7f2e) 18.90%.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2117   +/-   ##
=======================================
  Coverage   18.89%   18.90%           
=======================================
  Files          95       95           
  Lines        8890     8897    +7     
=======================================
+ Hits         1680     1682    +2     
- Misses       6982     6985    +3     
- Partials      228      230    +2     

Impacted Files	Coverage Δ
pkg/application/v2app.go	29.31% <44.44%> (-0.03%)	⬇️
cmd/sealer/cmd/utils/application.go	60.00% <100.00%> (ø)

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[starnop]

LGTM