Fix mypy errors (assembler)

[Randl]

Summary

Following discussion, I'm splitting #8187 by module.

Details and comments

The are 10 errors left:

qiskit/assembler/assemble_schedules.py:62: error: Argument 1 to "_assemble_experiments" has incompatible type "List[Union[ScheduleBlock, Union[Schedule, Instruction], Tuple[int, Union[Schedule, Instruction]]]]"; expected "List[Union[Union[Schedule, Instruction], Tuple[int, Union[Schedule, Instruction]]]]"  [arg-type]
qiskit/assembler/assemble_schedules.py:103: error: Argument 1 to "target_qobj_transform" has incompatible type "Union[Union[Schedule, Instruction], Tuple[int, Union[Schedule, Instruction]]]"; expected "Union[ScheduleBlock, Schedule, Union[Tuple[int, Instruction], Instruction], Iterable[Union[Tuple[int, Instruction], Instruction]]]"  [arg-type]
qiskit/assembler/assemble_schedules.py:207: error: Argument 1 to "sha256" has incompatible type "ndarray[Any, Any]"; expected "Union[bytes, Union[bytearray, memoryview, array[Any], mmap, _CData, PickleBuffer]]"  [arg-type]
qiskit/assembler/assemble_schedules.py:213: error: "Pulse" has no attribute "samples"  [attr-defined]
qiskit/assembler/assemble_schedules.py:224: error: Value of type variable "SupportsRichComparisonT" of "max" cannot be "Union[int, ParameterExpression]"  [type-var]
qiskit/assembler/assemble_schedules.py:224: error: Incompatible types in assignment (expression has type "Union[int, ParameterExpression]", variable has type "int")  [assignment]
qiskit/assembler/assemble_schedules.py:234: error: Argument 1 to "_validate_meas_map" has incompatible type "defaultdict[Tuple[int, Union[int, ParameterExpression]], List[Acquire]]"; expected "Dict[Tuple[int, Acquire], List[Acquire]]"  [arg-type]
qiskit/assembler/assemble_schedules.py:262: error: Unsupported operand types for + ("int" and "Acquire")  [operator]
qiskit/assembler/assemble_schedules.py:283: error: Unsupported operand types for + ("int" and "Acquire")  [operator]
qiskit/assembler/disassemble.py:263: error: Invalid index type "MeasureChannel" for "Dict[DriveChannel, Any]"; expected type "DriveChannel"  [index]

Some of those are related to Schedule, not sure what the fix should be. Some others are related to the fact that Acquire properties may be ParameterExpression but are summed/compared to int (this is common problem in other places too).

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[coveralls]

Pull Request Test Coverage Report for Build 5058087172

• 8 of 8 (100.0%) changed or added relevant lines in 3 files are covered.
• 6 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.06%) to 85.926%

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Files with Coverage Reduction	New Missed Lines	%
crates/accelerate/src/sabre_swap/mod.rs	2	99.53%
crates/qasm2/src/lex.rs	4	90.89%

Totals
Change from base Build 5050064110:	0.06%
Covered Lines:	71193
Relevant Lines:	82854

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 7370764643

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.03%) to 87.528%

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Totals
Change from base Build 7369683756:	-0.03%
Covered Lines:	59240
Relevant Lines:	67681

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💛 - Coveralls