LIVE-2080 Use HTTPS instead of HTTP for solana validators URL

[ghost]

Context (issues, jira)

https://ledgerhq.atlassian.net/browse/LIVE-2080

Description / Usage

Endpoint to fetch Solana validators was incorrectly using HTTP instead of HTTPS.
It also had an unwanted extra / at the end.

Before

$ curl -v http://validators-solana.coin.ledger.com//api/v1/validators/mainnet.json
*   Trying 2606:4700::6812:194a:80...
* TCP_NODELAY set
* Connected to validators-solana.coin.ledger.com (2606:4700::6812:194a) port 80 (#0)
> GET //api/v1/validators/mainnet.json HTTP/1.1
> Host: validators-solana.coin.ledger.com
> User-Agent: curl/7.68.0
> Accept: */*
> 
* Mark bundle as not supporting multiuse
< HTTP/1.1 301 Moved Permanently
< Date: Thu, 21 Apr 2022 10:04:48 GMT
< Transfer-Encoding: chunked
< Connection: keep-alive
< Cache-Control: max-age=3600
< Expires: Thu, 21 Apr 2022 11:04:48 GMT
< Location: https://validators-solana.coin.ledger.com//api/v1/validators/mainnet.json
< Server: cloudflare
< CF-RAY: 6ff54c32ac7b999f-CDG
< 
* Connection #0 to host validators-solana.coin.ledger.com left intact

After

$ curl https://validators-solana.coin.ledger.com/api/v1/validators/mainnet.json
[{"network":"mainnet","account":"FaHURG5sdNdHrJAfbbqYt6ngG5C1XakpVPkp1LT8tSoz","name":null,"keybase_id":null,"www_url":null,"details":null,"avatar_url":null,"created_at":"2022-01-12 20:51:25 UTC","updated_at":"2022-03-21 10:20:59 UTC","admin_warning":null,"active_stake":60725112081069,"authorized_withdrawer_score":0,"commission":10,"data_center_concentration_score":0,"delinquent":false,"published_information_score":0,"root_distance_score":2,"security_report_score":0,"skipped_slot_score":2,"software_version":"1.9.16","software_version_score":2,"stake_concentration_score":0 ...

Expectations

• Test coverage: The changes of this PR are covered by test. Unit test were added with mocks when depending on a backend/device.
• No impact: The changes of this PR have ZERO impact on the userland. Meaning, we can use these changes without modifying LLD/LLM at all. It will be a "noop" and the maintainers will be able to bump it without changing anything.

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Name	Status	Preview	Updated
ledger-live-common	❌ Failed (Inspect)		Apr 21, 2022 at 0:16AM (UTC)