feat: Decouple SQL agent from SSIS

[GooseLF]

Decoupling deployment of SSIS from the deployment of SQL Agent Jobs/steps/schedules so that the tool can be used solely for the deployment of SQL Agent.

• deploy.py
  • Introduced new method for deploying SQL Agent
  • Refactored deploy_ssis to account for changes
• sql-deployment-tools.py
  • Refactored to deploy SSIS and SQL agent separately. SSIS will now only deploy if the ispac argument is set.
• model.py
  • Made SsisDeployment.project optional
  • Made SsisDeployment.folder optional
• test/test_model.py
  • Refactored tests to account for changes

[github-actions[bot]]

Unit Test Results

44 tests  ±0   43 :heavy_check_mark: ±0   0s :stopwatch: ±0s   1 suites ±0     1 :zzz: ±0    1 files   ±0     0 :x: ±0 

Results for commit 7e592f05. ± Comparison against base commit 6ff145f0.

This pull request removes 4 and adds 4 tests. Note that renamed tests count towards both.

``` test.test_model.TestSsisDeployment ‑ test_SsisDeployment_throws_an_exception_when_folder_is_in_config test.test_model.TestSsisDeployment ‑ test_SsisDeployment_throws_an_exception_when_folder_is_not_set test.test_model.TestSsisDeployment ‑ test_SsisDeployment_throws_an_exception_when_project_is_not_in_config test.test_model.TestSsisDeployment ‑ test_SsisDeployment_throws_an_exception_when_project_name_is_not_set ``` ``` test.test_model.TestSsisDeployment ‑ test_SsisDeployment_throws_no_exception_when_folder_is_in_config test.test_model.TestSsisDeployment ‑ test_SsisDeployment_throws_no_exception_when_folder_is_not_set test.test_model.TestSsisDeployment ‑ test_SsisDeployment_throws_no_exception_when_project_is_not_in_config test.test_model.TestSsisDeployment ‑ test_SsisDeployment_throws_no_exception_when_project_name_is_not_set ```