refactor: replace github.com/olekukonko/tablewriter with text/tablewriter

[kruskall]

Proposed commit message

replace github.com/olekukonko/tablewriter with text/tablewriter

the downside is that there's no separator between headers and table content but that's a style issue.
Header content has been uppercased to keep the same behaviour (tablewriter was uppercasing them under the hood).

columns are separated by | just like before but there's no +------+-----------------------+--------+ at the beginning and the end of the table.

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

Disruptive User Impact

Author's Checklist

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[mergify]

This pull request does not have a backport label.
If this is a bug or security fix, could you label this PR @kruskall? 🙏.
For such, you'll need to label your PR with:

• The upcoming major version of the Elastic Stack
• The upcoming minor version of the Elastic Stack (if you're not pushing a breaking change)

To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-v8./d.0 is the label to automatically backport to the 8./d branch. /d is the digit

[mergify]

backport-8.x has been added to help with the transition to the new branch 8.x.
If you don't need it please use backport-skip label and remove the backport-8.x label.

[mergify]

This pull request is now in conflicts. Could you fix it? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b refactor/tablewriter upstream/refactor/tablewriter
git merge upstream/main
git push upstream refactor/tablewriter

[elasticmachine]

Pinging @elastic/obs-ds-hosted-services (Team:obs-ds-hosted-services)

[mergify]

This pull request is now in conflicts. Could you fix it? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b refactor/tablewriter upstream/refactor/tablewriter
git merge upstream/main
git push upstream refactor/tablewriter

[efd6]

It would be nice to gate this output behind a verbose flag; at the moment go test emits all this, but this behaviour is not conventional for go testing. If this is done, it could be in another PR.

[kruskall]

It would be nice to gate this output behind a verbose flag; at the moment go test emits all this, but this behaviour is not conventional for go testing. If this is done, it could be in another PR.

I've updated the test to use the test writer so it should be consistent with test flags and log behaviour (e.g. log during failure or verbose flag)

EDIT: go 1.25 only :(