deploy: feat: add polling system to dynamic reloading (googleapis#2466)

Support polling system to existing Toolbox dynamic reloading feature.
| flag | description | default |
| --- | --- | --- |
| `--poll-interval` | Specifies the polling frequency (seconds) for
configuration file updates. | `0` |

With `--poll-interval` = 0, it will not run the polling system at all.

When polling is active, Toolbox checks for configuration file updates at
every specified interval (in seconds).

Fixes googleapis#2346

---------

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
Co-authored-by: Wenxin Du <117315983+duwenxin99@users.noreply.github.com> fcaac9b

Author: renovate-bot

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