fix scheduler to take input from setting page

[bingzhang]

Description

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Fixes #(add issue number here and remove parentheses)

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[sandeep-ps]

Hi, @bingzhang, Thanks. I have feedback on a few items:

1. Please update the pull request description to fill in the checklist entries. This information will be helpful for all reviewers (current or new). Thanks.
2. Please update the settings page text about download scheduling to include details about the timezone. Here is a suggestion: Events from these calendars will be crawled, parsed, and published daily at the scheduled time displayed below. The default scheduled time is 11:00 PM (Central Time). You can set a different time below.
3. When I tried changing the time using the develop branch, it's working locally. With the change in this PR, a PytzUsageWarning warning about the timezone goes away. So, it's definitely an improvement, but to test if this would fix the actual problem, this will need to be deployed to the DEV instance.
4. After I set the time using the Settings page and restarting Events Manager (consider the example of container restarting due to some reason), Events Manager picks up the value in the environment and not the user input that's in the database. I think the core issue is that the Events Manager needs to prefer the user setting over the environment variable setting. Please fix this. Thanks.

[sandeep-ps]

Provided feedback in a separate comment.

[bingzhang]

Hi, @bingzhang, Thanks. I have feedback on a few items:

1. Please update the pull request description to fill in the checklist entries. This information will be helpful for all reviewers (current or new). Thanks.
2. Please update the settings page text about download scheduling to include details about the timezone. Here is a suggestion: Events from these calendars will be crawled, parsed, and published daily at the scheduled time displayed below. The default scheduled time is 11:00 PM (Central Time). You can set a different time below.
3. When I tried changing the time using the develop branch, it's working locally. With the change in this PR, a PytzUsageWarning warning about the timezone goes away. So, it's definitely an improvement, but to test if this would fix the actual problem, this will need to be deployed to the DEV instance.
4. After I set the time using the Settings page and restarting Events Manager (consider the example of container restarting due to some reason), Events Manager picks up the value in the environment and not the user input that's in the database. I think the core issue is that the Events Manager needs to prefer the user setting over the environment variable setting. Please fix this. Thanks.

@sandeep-ps I updated the pr. I created a new issue related to your comments. #1035

[sandeep-ps]

Approving for further testing after deployment. Thanks.

[sandeep-ps]

Bing, if there is no remaining feedback, I think you can merge this. Thanks.

[minump]

LGTM

[jianyuan-zhan]

The conflict fix looks good.