removed the deprecated code since 0.23

[neet-14]

Summary

Fixes #11145
Changelog: Removal

Details and comments

• Removed the interp1d, step_wise functions from qiskit/visualization/pulse/interpolation.py and also removed relevant tests.
• Added a release note.

[CLAassistant]

All committers have signed the CLA.

[qiskit-bot]

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[coveralls]

Pull Request Test Coverage Report for Build 6720102596

Warning: This coverage report may be inaccurate.

We've detected an issue with your CI configuration that might affect the accuracy of this pull request's coverage report.
To ensure accuracy in future PRs, please see these guidelines.
A quick fix for this PR: rebase it; your next report should be accurate.

• 2 of 2 (100.0%) changed or added relevant lines in 2 files are covered.
• 8 unchanged lines in 3 files lost coverage.
• Overall coverage increased (+0.02%) to 86.918%

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Files with Coverage Reduction	New Missed Lines	%
qiskit/visualization/pulse/matplotlib.py	2	0.0%
crates/qasm2/src/lex.rs	3	91.16%
qiskit/pulse/library/waveform.py	3	93.75%

Totals
Change from base Build 6718708201:	0.02%
Covered Lines:	74014
Relevant Lines:	85154

---

💛 - Coveralls

[ElePT]

Thank you for your attempt at this contribution. Please see my comment on #11188 (review) regarding this PR.

[ElePT]

Closing this PR in favor of #11213