Garbage collection error: Unexpected data after root element - follow up to #13554

Description

Found while testing https://github.com/brave/brave-browser/issues/13554.

Performing a garbage-collection sweep via the button on brave://ipfs throws "Garbage collection error: Line: 2, column: 1, Unexpected data after root element."

Steps to Reproduce

1. new profile, launch Brave nightly
2. load brave://ipfs
3. click Install and start
4. wait for the daemon/node to start
5. now click Perform a garbage collection sweep

Actual result:

Throws “Garbage collection error: Line: 2, column: 1, Unexpected data after root element” error

Expected result:

Reproduces how often:

Brave version (brave://version info)

Brave	1.23.2 Chromium: 89.0.4389.58 (Official Build) nightly (x86_64)
Revision	1a139f28ecc27719439e37c6b1533cee999cb802-refs/branch-heads/4389@{#1134}

Version/Channel Information:

• Can you reproduce this issue with the current release? no
• Can you reproduce this issue with the beta channel? no
• Can you reproduce this issue with the nightly channel? yes

cc: @bbondy @spylogsster

[spylogsster]

as discussed with @lidel the response code is enough for us and we should not alert about json parsing errors, added PR about it

[LaurenWags]

@brave/legacy_qa when retesting this the steps from https://github.com/brave/brave-browser/issues/13554#issuecomment-790725164 can also be used. However, per @spylogsster in https://github.com/brave/brave-browser/issues/13554#issuecomment-794071778 we should visit additional sites to increase storage usage prior to running garbage collection.