Add New Campaign - Source Dropdown

[arniebradfo]

Changes

• Modified NewCampaignDialog.tsx to use an <HTMLSelect/> component instead of <Tabs/>. This approach is more clear for larger numbers of parser options. The Tab bar filled up too quickly.
• Edited several portions of the custom parser user guide and docs to accommodate the changes:
  • different tabTitle naming convention
  • replace references to "tabs" with references to "dropdown"
  • update screenshot to new UI

Test

@ccarpenter28 & @sang2925

• This will certainly break tests. Do a global find for create-new-camp to see the cypress bindings that will need to be repaired.
• One key change: there is no longer a default parser or upload selected. Instead, there is a placeholder message forcing a user to explicitly choose a parser before continuing.
• Please make sure this works in both RedTeam and BlueTeam Modes

Screenshots

Also see the new parser guide screenshot: custom-parser-upload-tab.png