chore: Remove tool.hatch.build.targets from pyproject

[kramaranya]

What this PR does / why we need it:

I removed the redundant hatch build target from pyproject.toml

The old table [tool.hatch.build.targets] is not correct, it's supposed to be in [tool.hatch.build.targets.wheel] instead -- https://hatch.pypa.io/1.9/config/build/#packages
But since we have a single package, I’m not adding [tool.hatch.build.targets.wheel] either, because hatchling finds the package on its own -- https://hatch.pypa.io/1.9/plugins/builder/wheel/#default-file-selection

/assign @andreyvelich @astefanutti @Electronic-Waste

[coveralls]

Pull Request Test Coverage Report for Build 17294910153

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 2 unchanged lines in 2 files lost coverage.
• Overall coverage remained the same at 65.033%

---

Files with Coverage Reduction	New Missed Lines	%
kubeflow/trainer/backends/kubernetes/backend.py	1	70.26%
kubeflow/trainer/utils/utils.py	1	58.9%

Totals
Change from base Build 17241245329:	0.0%
Covered Lines:	292
Relevant Lines:	449

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 17294910153

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 2 unchanged lines in 2 files lost coverage.
• Overall coverage remained the same at 65.033%

---

Files with Coverage Reduction	New Missed Lines	%
kubeflow/trainer/backends/kubernetes/backend.py	1	70.26%
kubeflow/trainer/utils/utils.py	1	58.9%

Totals
Change from base Build 17241245329:	0.0%
Covered Lines:	292
Relevant Lines:	449

---

💛 - Coveralls

[astefanutti]

/lgtm

Thanks @kramaranya.

[andreyvelich]

Thank you @kramaranya!
You might want to delete it from the modules as well: https://github.com/kubeflow/trainer/blob/master/api/python_api/pyproject.toml#L38-L39

[andreyvelich]

/approve

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