Fixed #600 Assert against non-sensible excluded_accounts

[smoy]

What changed?

• Assert against non-sensible excluded_accounts

Rationale

• During import phase, we don't want to generate non-sensible excluded_accounts. If it's a new template, import logic does not know how to generate exclude_accounts. If there is an existing template, the best it can do if old template doesn't have exclude_account, it shouldn't add new excluded_accounts.

How was it tested?

If it was manually verified, list the instructions for your reviewers to follow.

• [ ] Unit Tests
• [ ] Functional Tests
• [ ] Manually Verified

Relying existing test suite.

[codecov[bot]]

Codecov Report

Patch coverage: 33.33% and project coverage change: -9.75% :warning:

Comparison is base (e3f5f0c) 83.01% compared to head (3c5ed76) 73.27%. Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #601 +/- ## ========================================== - Coverage 83.01% 73.27% -9.75% ========================================== Files 105 105 Lines 12549 12560 +11 ========================================== - Hits 10418 9203 -1215 - Misses 2131 3357 +1226 ``` | [Flag](https://app.codecov.io/gh/noqdev/iambic/pull/601/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=noqdev) | Coverage Δ | | |---|---|---| | [functional_tests](https://app.codecov.io/gh/noqdev/iambic/pull/601/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=noqdev) | `?` | | | [functional_tests_config_discovery](https://app.codecov.io/gh/noqdev/iambic/pull/601/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=noqdev) | `?` | | | [unit_tests](https://app.codecov.io/gh/noqdev/iambic/pull/601/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=noqdev) | `73.27% <33.33%> (-0.05%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=noqdev#carryforward-flags-in-the-pull-request-comment) to find out more. | [Files Changed](https://app.codecov.io/gh/noqdev/iambic/pull/601?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=noqdev) | Coverage Δ | | |---|---|---| | [iambic/core/template\_generation.py](https://app.codecov.io/gh/noqdev/iambic/pull/601?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=noqdev#diff-aWFtYmljL2NvcmUvdGVtcGxhdGVfZ2VuZXJhdGlvbi5weQ==) | `84.84% <33.33%> (-6.84%)` | :arrow_down: | ... and [49 files with indirect coverage changes](https://app.codecov.io/gh/noqdev/iambic/pull/601/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=noqdev)

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