Better error message for config loading failures

[tufanbarisyildirim]

I had an old installation and I see that my client.yaml is outdated. The message was something like

Cannot open wallet config file at "/Users/tufan/.sui/sui_config/client.yaml"

This can happen due to various reasons, so I added the root error message now I see that;

➜  sui git:(main) ✗ ./target/debug/sui  client 
Cannot open wallet config file at "/Users/tufan/.sui/sui_config/client.yaml". Error: missing field `envs` at line 2 column 9

and

➜  sui git:(main) ✗ ./target/debug/sui client
Cannot open wallet config file at "/Users/tufan/.sui/sui_config/client.yaml". Error: "Invalid Keypair file \"Invalid bytes\" \"/Users/tufan/.sui/sui_config/sui.keystore\" at line 2 column 9"

for different cases.

I also see the original error is ignored in some other places but I did not want to mess that PR

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[tufanbarisyildirim]

it is fixed here: https://github.com/MystenLabs/sui/pull/9696 closing this