[Drafting] Add Direct Job Submission Functionality (Pending + Feed)

[alliu879]

What's new in this PR

Description

• Add helper function for conditionally saving jobs to notApprovedJobs and approvedJobs collections in the Draft page
• Export firebase constants in job.ts for job collection names

Screenshots

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How to review

• Save job draft to drafts using 'Save to Drafts' button and verify that the pending job screen is properly updated
• Post job to feed using 'Post Job' button and verify that the feed is correctly updated

Next steps

• Style 'Save to Drafts' button in Draft.tsx so that it is no longer green

Relevant Links

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Online sources

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Related PRs

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CC: @surajr10 @themiachou8