fix json output for check results

[AstroProfundis]

What problem does this PR solve?

The output of check command in tup-cluster is a ASCII table, fix #1719

What is changed and how it works?

Make it a JSON string when --format=json is set

Check List

Tests

• Manual test (add detailed scripts or steps below)

Related changes

• Need to cherry-pick to the release branch

Release notes:

NONE

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• srstack

To complete the pull request process, please ask the reviewers in the list to review by filling /cc @reviewer in the comment.
After your PR has acquired the required number of LGTMs, you can assign this pull request to the committer in the list by filling /assign @committer in the comment to help you merge this pull request.

The full list of commands accepted by this bot can be found here.

Reviewer can indicate their review by submitting an approval review.
Reviewer can cancel approval by submitting a request changes review.

[codecov-commenter]

Codecov Report

Merging #1720 (ae92c46) into master (6fe71fe) will decrease coverage by 6.05%.
The diff coverage is 25.93%.

❗ Current head ae92c46 differs from pull request most recent head 2bd042e. Consider uploading reports for the commit 2bd042e to get more accurate results

@@            Coverage Diff             @@
##           master    #1720      +/-   ##
==========================================
- Coverage   53.22%   47.17%   -6.05%     
==========================================
  Files         303      302       -1     
  Lines       34270    34480     +210     
==========================================
- Hits        18237    16263    -1974     
- Misses      13886    16099    +2213     
+ Partials     2147     2118      -29     

Flag	Coverage Δ
dm	23.31% <0.00%> (-1.51%)	⬇️
unittest	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/cluster/manager/check.go	60.65% <25.93%> (-8.24%)	⬇️
pkg/utils/regexp.go	0.00% <0.00%> (-100.00%)	⬇️
components/dm/ansible/worker.go	0.00% <0.00%> (-100.00%)	⬇️
pkg/meta/err.go	0.00% <0.00%> (-76.19%)	⬇️
pkg/cluster/api/error.go	0.00% <0.00%> (-75.00%)	⬇️
pkg/crypto/rand/passwd.go	0.00% <0.00%> (-75.00%)	⬇️
pkg/utils/semver.go	10.18% <0.00%> (-74.25%)	⬇️
pkg/telemetry/node_info.go	0.00% <0.00%> (-70.73%)	⬇️
pkg/utils/error.go	0.00% <0.00%> (-64.29%)	⬇️
components/dm/ansible/import.go	0.00% <0.00%> (-61.63%)	⬇️
... and 55 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 6fe71fe...2bd042e. Read the comment docs.

[srstack]

LGTM

[AstroProfundis]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 2bd042e