fix: only fail announcing phase in the end

[caarlos0]

This prevents one announce failure to skip all other announcers.

The release will still report a failure in the end, but will not fail in the first failure.

Also improved errors messages a little bit.

closes #3663

[vercel]

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Name	Status	Preview	Updated
goreleaser	🔄 Building (Inspect)		Dec 28, 2022 at 2:07PM (UTC)

[codecov]

Codecov Report

Merging #3666 (df23247) into main (1d2842c) will increase coverage by 0.02%.
The diff coverage is 62.33%.

@@            Coverage Diff             @@
##             main    #3666      +/-   ##
==========================================
+ Coverage   83.58%   83.60%   +0.02%     
==========================================
  Files         118      118              
  Lines        9912     9926      +14     
==========================================
+ Hits         8285     8299      +14     
  Misses       1311     1311              
  Partials      316      316              

Impacted Files	Coverage Δ
internal/pipe/smtp/smtp.go	19.60% <0.00%> (ø)
internal/pipe/webhook/webhook.go	72.36% <37.50%> (ø)
internal/pipe/discord/discord.go	50.00% <40.00%> (ø)
internal/pipe/mattermost/mattermost.go	79.45% <40.00%> (ø)
internal/pipe/teams/teams.go	52.00% <40.00%> (ø)
internal/pipe/linkedin/linkedin.go	53.33% <50.00%> (ø)
internal/pipe/reddit/reddit.go	70.73% <50.00%> (ø)
internal/pipe/telegram/telegram.go	55.17% <50.00%> (ø)
internal/pipe/mastodon/mastodon.go	54.83% <66.66%> (ø)
internal/pipe/twitter/twitter.go	66.66% <66.66%> (ø)
... and 4 more

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