Cannot set JSON config value using magentoCLI

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### Preconditions

1. Magento 2.3.4 (incl. Vertex) w/ MFTF 2.5.3 (cursory glance suggests issue occurs with `develop` branch)

### Steps to reproduce
1. Modify test VertexAsRegisteredCustomerCheckTaxWhenFlexibleFieldIsSentForEcoProducts to not after step `setupFlexFieldConfig`
2. Modify before step `setupFlexFieldConfig` in same test to be:
```xml

```
3. Check `core_config_data` table for path 'tax/vertex_flexfields/code'

### Expected result

1. Value is `[{"field_id":"1","field_source":"product.custom.[CODE]"}]`

### Actual result

1. Value is `\[\{\"field_id\":\"1\",\"field_source\":\"product.custom.[CODE]\"\}\]`

This is caused by PHP's `escapeshellcmd` method call: https://github.com/magento/magento2-functional-testing-framework/blob/develop/etc/config/command.php#L26

https://github.com/magento/magento2-functional-testing-framework/blob/d82e6cf1e798a3266ae23582ae53fc6b77fa452d/etc/config/command.php#L25-L27

If the `'` is not included, the result instead has the brackets not escaped (properly) but removes the quotation marks entirely. I have failed to find any combination of escaping that comes out of `escapeshellcmd` in a way that sets this configuration value correctly.

By itself, it is handled properly by `escapeshellarg` but I am not aware of any reliable way to automatically determine individual arguments in `$arguments`

Start with etc/config/command.php at the escapeshellcmd call and reproduce the issue using the VertexAsRegisteredCustomerCheckTaxWhenFlexibleFieldIsSentForEcoProducts test and its setupFlexFieldConfig step. Trace how config:set arguments are assembled, then verify the tax/vertex_flexfields/code value in core_config_data matches the unescaped JSON shown in the expected result.

Written by the indexing model from the issue text.