[lambda][flare] Ask for user confirmation before sending files to support

[nhulston]

What and why?

For more context on what Lambda Flare is, please read the description in this PR: #924

We want to ask users for confirmation before sending their files to support.
If they answer no, the flare files are not sent and are deleted
They must answer yes before the files are sent to support.
This is intended to:

1. Give the user an opportunity to check the files and see if there is anything they don't want to send to support
2. Prevent users from accidentally spamming their support ticket with files

How?

Use inquirer to prompt the user for confirmation.
Exit the program early if they answer no, continue otherwise.

Review checklist

• Feature or bugfix MUST have appropriate tests (unit, integration)

[datadog-datadog-prod-us1]

Datadog Report

Branch report: nicholas.hulston/serverless-flare/ask-before-sending-flare-files
Commit report: cddb492

❌ datadog-ci-tests: 3 Failed (0 Known Flaky), 0 New Flaky, 4488 Passed, 0 Skipped, 1m 46.58s Wall Time

❌ Failed Tests (3)

• lambda flare does not send when user answers prompt with no - src/commands/lambda/__tests__/flare.test.ts - Details

  Expand for error

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   Snapshot name: \`lambda flare does not send when user answers prompt with no 1\`
   
   �[35m�[103m- Snapshot  - 1�[49m�[39m
   �[36m�[107m+ Received  + 1�[49m�[39m
   
   �[33m@@ -6,11 +6,11 @@�[39m
   �[2m  🔍 Fetching Lambda function configuration...�[22m
   
   ...
  

• lambda flare does not send when user answers prompt with no - src/commands/lambda/__tests__/flare.test.ts - Details

  Expand for error

   �[2mexpect(�[22m�[36m�[107mreceived�[49m�[39m�[2m).�[22mtoMatchSnapshot�[2m()�[22m
   
   Snapshot name: \`lambda flare does not send when user answers prompt with no 1\`
   
   �[35m�[103m- Snapshot  - 1�[49m�[39m
   �[36m�[107m+ Received  + 1�[49m�[39m
   
   �[33m@@ -6,11 +6,11 @@�[39m
   �[2m  🔍 Fetching Lambda function configuration...�[22m
   
   ...
  

• lambda flare does not send when user answers prompt with no - src/commands/lambda/__tests__/flare.test.ts - Details

  Expand for error

   �[2mexpect(�[22m�[36m�[107mreceived�[49m�[39m�[2m).�[22mtoMatchSnapshot�[2m()�[22m
   
   Snapshot name: \`lambda flare does not send when user answers prompt with no 1\`
   
   �[35m�[103m- Snapshot  - 1�[49m�[39m
   �[36m�[107m+ Received  + 1�[49m�[39m
   
   �[33m@@ -6,11 +6,11 @@�[39m
   �[2m  🔍 Fetching Lambda function configuration...�[22m
   
   ...