Remove/deprecate remainain instances of _with_issues functions - #272

The `ElectricalComponent` message-level converters are new in this
development cycle (v0.4.0 shipped only the enum converters in this module),
so the `_with_issues` flavor was never released and can be removed outright
rather than deprecated.

Every diagnostic it collected is already encoded in the returned type:

  * an unspecified category  -> `UnspecifiedElectricalComponent`
  * an unrecognized category -> `UnrecognizedElectricalComponent`
  * a category that disagrees with its carried info ->
    `MismatchedCategoryElectricalComponent`
  * an unspecified/unrecognized battery, EV charger or inverter type ->
    the matching `Unrecognized*` class (preserving the raw wire `type`)

Routing the same facts through a side-channel `major_issues`/`minor_issues`
string list (and the wrapper's warning/debug logging built from it) was
therefore redundant.

Fold the conversion into the plain `electrical_component_from_proto`, which
now reports malformed input purely via the returned type, and simplify the
private helper to `_electrical_component_base_from_proto` (no issue
arguments). The now-unused `logging` import and module logger go with them.

Signed-off-by: Leandro Lucarella <luca-frequenz@llucax.com>

The `MetricSample` and `MetricConnection` converters only shipped in the
`_with_issues` flavor, which reports an unspecified/unrecognized metric or
category through a side-channel `major_issues`/`minor_issues` string list.
That information is already carried by the returned type, though:
`MetricSample.metric` and `MetricConnection.category` are `... | int` (the
raw `0` for unspecified, the raw value for unrecognized) and bounds are a
`BoundsSet | InvalidBoundsSet`, so the issue list is redundant.

Add plain `metric_sample_from_proto` and `metric_connection_from_proto`
converters that drop the issue arrays and let callers read validity off the
returned object (or the raising `get_*()` accessors). `RELEASE_NOTES.md`
already referred to `metric_sample_from_proto` as the dataclass-level
converter; this makes it real.

The released `_with_issues` variants are intentionally left untouched here;
they are deprecated in a follow-up commit.

Signed-off-by: Leandro Lucarella <luca-frequenz@llucax.com>

`metric_sample_from_proto_with_issues` and
`metric_connection_from_proto_with_issues` were released in v0.4.0, so they
are deprecated rather than removed, in favour of the type-system
`metric_sample_from_proto` / `metric_connection_from_proto` added in the
previous commit. Add the `@deprecated` decorator and a `Warning: Deprecated`
docstring admonition to both, matching the existing
`bounds_from_proto_with_issues` deprecation.

`metric_sample_from_proto_with_issues` still delegates to the now-deprecated
`metric_connection_from_proto_with_issues` to preserve its released
issue-collecting behaviour, so wrap that internal call in a
`warnings.catch_warnings()` block: calling the sample converter then emits
only its own `DeprecationWarning`, not the connection one as well.

Update the existing tests to expect the deprecation via
`pytest.deprecated_call`; the raw-int-0 / no-enum-warning guarantees now live
on the new converters' tests.

Signed-off-by: Leandro Lucarella <luca-frequenz@llucax.com>