Fixed paddle.math.heaviside for all frontends

[ZJay07]

PR Description

float16 is unsupported and causing the error

Related Issue

Closes # #28514
Closes # #28515
Closes # #28516
Closes # #28517

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• Did you add a function?
• Did you add the tests?
• Did you run your tests and are your tests passing?
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[Ishticode]

This is correct. paddles heaviside doesn't seem to work for float16. Thanks @ZJay07 :)