[RHELC-1554] Fix ELS repositories not fallback in case of error

[r0x0d]

We want to try to enable the ELS repos, and if case that fails, we want to make sure we enable the default rhel repoids.

Jira Issues:

• RHELC-1554

Checklist

• [ ] PR has been tested manually in a VM (either author or reviewer)
• [ ] Jira issue has been made public if possible
• [ ] [RHELC-] is part of the PR title
• [ ] GitHub label has been added to help with Release notes
• [ ] PR title explains the change from the user's point of view
• [ ] Code and tests are documented properly
• [ ] The commits are squashed to as few commits as possible (without losing data)
• [ ] When merged: Jira issue has been updated to Release Pending if relevant

[has-bot]

/packit test --labels tier0

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Comment generated by an automation.

Log | Bot Usage

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.42%. Comparing base (5ba85ef) to head (3dbcc26).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1229 +/- ## ======================================= Coverage 95.42% 95.42% ======================================= Files 54 54 Lines 4698 4699 +1 Branches 829 829 ======================================= + Hits 4483 4484 +1 Misses 132 132 Partials 83 83 ``` | [Flag](https://app.codecov.io/gh/oamg/convert2rhel/pull/1229/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=oamg) | Coverage Δ | | |---|---|---| | [centos-linux-7](https://app.codecov.io/gh/oamg/convert2rhel/pull/1229/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=oamg) | `90.63% <100.00%> (+<0.01%)` | :arrow_up: | | [centos-linux-8](https://app.codecov.io/gh/oamg/convert2rhel/pull/1229/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=oamg) | `91.55% <100.00%> (+<0.01%)` | :arrow_up: | | [centos-linux-9](https://app.codecov.io/gh/oamg/convert2rhel/pull/1229/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=oamg) | `91.61% <100.00%> (+<0.01%)` | :arrow_up: | 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=oamg#carryforward-flags-in-the-pull-request-comment) to find out more.

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[r0x0d]

/packit test --labels tier0

[bookwar]

As discussed in the ticket, rather than adding fallback for ELS repositories, let's remove fallback for EUS too.

As ELS and EUS repositories are now requested explicitly via command line switch, the proper fallback is for a user to remove the incorrect cli option. We should not try to do this implicitly during the conversion.

[r0x0d]

Alright, will open a PR for that in a minute.