Take into account user provider_installation settings when using Terragrunt Provider Cache

[levkohimins]

Describe the feature

1. If there is a provider_installation block in the use CLI configuration .terraformrc, terraform returns errors Error: At most one provider_installation block can be specified, this is because Terragrunt Provider Cache adds another block, so we need to merge them into one.
2. If the user CLI configuration .terraformrc has network_mirror settings, this should be taken into account when configuring Terragrunt Provider Cache. That is, Terragrunt Provider Cache server should make requests not to the remote register, but to the one specified in the network_mirror settings.

[levkohimins]

Resolved in v0.58.7 release.