Describe the bug
When running MY_PROGRAM_STAGE=development python test.py, I get dynaconf.validator.ValidationError: TEST_1 is required in env production when the environment has been set to development.

To Reproduce
Steps to reproduce the behavior:

1. Having the following folder structure

.
├── test.py
└── test.yaml

1 directory, 2 files

2. Having the following config files:

production:

development:
  TEST_2: "bar"

3. Having the following app code:

from pathlib import Path

from dynaconf import Dynaconf, Validator

settings = Dynaconf(
    settings_files=[Path.cwd() / "test.yaml"],
    environments=True,
    env_switcher="MY_PROGRAM_STAGE",
    envvar_prefix="MY_PROGRAM",
    merge_enabled=True,
    validators=[
        Validator("TEST_1", env="production", must_exist=True),
        Validator("TEST_2", env="development", must_exist=True),
    ],
)

print(settings.items())

4. Executing under the following environment

Expected behavior
Running MY_PROGRAM_STAGE=development python test.py should not fail because we're not running in production, so it shouldn't matter that there's no value for TEST_1.

Environment (please complete the following information):

• OS: MacOS 13.3.1 (22E261), M1 Pro.
• Python 3.10.8 (main, May 18 2023, 20:50:03) [Clang 14.0.3 (clang-1403.0.22.14.1)]
• Poetry (version 1.4.2)
• dynaconf == 3.1.12
• Frameworks in use: None.