Deprecate -nodeport discovery ConfigMap

[nightkr]

Description

See #765

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1. Code contains useful comments
2. Code contains useful logging statements
3. (Integration-)Test cases added
4. Documentation added or updated. Follows the style guide.
5. Changelog updated
6. Cargo.toml only contains references to git tags (not specific commits or branches)

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[nightkr]

Release note:

The -nodeport discovery ConfigMaps have been deprecated for removal. Use the primary discovery CMs instead. See #765 for more information.

[sbernauer]

Nice!