[chore](cloud) Improve cloud start stop script: wait for quit synchronously

[gavinchou]

No description provided.

[doris-robot]

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[gavinchou]

run buildall

[github-actions]

sh-checker report

To get the full details, please check in the job output.

shellcheck errors

'shellcheck ' returned error 1 finding the following syntactical issues:
----------
In cloud/script/stop.sh line 36:
while [[ 1 ]]; do
^-- SC2161 (style): Instead of '[ 1 ]', use 'true'.
In cloud/script/stop.sh line 39:
msg=$(ps ${pid})
^----^ SC2086 (info): Double quote to prevent globbing and word splitting.
Did you mean: msg=$(ps "${pid}")
For more information:
https://www.shellcheck.net/wiki/SC2086 -- Double quote to prevent globbing ...
https://www.shellcheck.net/wiki/SC2161 -- Instead of '[ 1 ]', use 'true'.
----------
You can address the above issues in one of three ways:
1. Manually correct the issue in the offending shell script;
2. Disable specific issues by adding the comment:
# shellcheck disable=NNNN
above the line that contains the issue, where NNNN is the error code;
3. Add '-e NNNN' to the SHELLCHECK_OPTS setting in your .yml action file.

shfmt errors

'shfmt ' found no issues.

[github-actions]

clang-tidy review says "All clean, LGTM! 👍"

[gavinchou]

run buildall

[github-actions]

clang-tidy review says "All clean, LGTM! 👍"

[github-actions]

PR approved by anyone and no changes requested.

[dataroaring]

LGTM

[github-actions]

PR approved by at least one committer and no changes requested.