fix(flow): fix flow cls register

[hanxiao]

No description provided.

[deepankarm]

Should we allow to load a Flow from a string based yaml? This can be useful in jinad.

[github-actions]

Latency summary

Current PR yields:

• 🐢🐢 index QPS at 1716, delta to last 3 avg.: -9%
• 😶 query QPS at 31, delta to last 3 avg.: +0%

Breakdown

Version	Index QPS	Query QPS
current	1716	31
0.8.11	1894	31
0.8.10	1860	31
0.8.9	1914	29

Backed by latency-tracking. Further commits will update this comment.

[hanxiao]

@deepankarm it supports already. see https://docs.jina.ai/chapters/cli/jina-pea.html?highlight=uses

no it does not support

[github-actions]

Thanks for your contribution ❤️
💔 Unfortunately, this PR has one ore more bad commit messages, it can not be merged. To fix this problem, please refer to:

• Commit Message Guideline for the First Time Contributor
• Contributing Guideline

Note, other CI tests will not start until the commit messages get fixed.

This message will be deleted automatically when the commit messages get fixed.