Fix tag suggestions to show all relevant ones

[imajit]

Fixes #7289
The subscriptions page does not give tag suggestions based on tags saved in database .Instead it has hard-coded values .


The current results



Changes

Instead of fixed values it now shows values by fetching them from database .

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@6810e8f). Click here to learn what that means.
The diff coverage is 50%.

@@            Coverage Diff            @@
##             master    #7338   +/-   ##
=========================================
  Coverage          ?   81.87%           
=========================================
  Files             ?       97           
  Lines             ?     5604           
  Branches          ?        0           
=========================================
  Hits              ?     4588           
  Misses            ?     1016           
  Partials          ?        0

Impacted Files	Coverage Δ
app/models/tag.rb	97.48% <50%> (ø)

[plotsbot]

	2 Warnings
⚠️	It looks like you merged from master in this pull request. Please rebase to get rid of the merge commits – you may want to rewind the master branch and rebase instead of merging in from master, which can cause problems when accepting new code!
⚠️	There was an error with Danger bot’s Junit parsing: No JUnit file was found at output.xml

	2 Messages
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Screenshots 📸 (click to expand)

7338-test_questions.png

7338-test_embeddable_grids.png

7338-test_signup.png

7338-test_viewing_the_settings_page.png

7338-test_tag_by_author_page.png

7338-test_wiki_page_with_inline_grids.png

7338-test_stats.png

7338-test_viewing_the_dashboard.png

7338-test_searching_an_item_from_the_homepage.png

7338-test_signup_modal_form_validation.png

7338-test_tag_stats.png

7338-test_login_modal_form_validation.png

7338-test_questions_shadow.png

7338-test_login_modal.png

7338-test_profile_page.png

7338-test_comments.png

7338-test_tags.png

7338-test_signup_modal.png

7338-test_wiki.png

7338-test_methods.png

7338-test_tag_page.png

7338-test_blog_page_with_location_modal.png

7338-test_tag_wildcard.png

7338-test_signup_modal_disabled_submit_button_on_empty_username.png

7338-test_embeddable_thumbnail_grids.png

7338-test_front_page_with_navbar_search_autocomplete.png

7338-test_spam_moderation_page.png

7338-test_login.png

7338-test_viewing_the_dropdown_menu.png

7338-test_viewing_question_post.png

7338-test_mobile_displays.png

7338-test_simple-data-grapher_powertag.png

7338-test_front.png

7338-test_question_page.png

7338-test_tag_contributors_page.png

7338-test_blog.png

7338-test_people.png

7338-test_wiki_revisions.png

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[imajit]

@Uzay-G can you please review this pr

[Uzay-G]

Great job @imajit! Nice use of pluck 👍

[Uzay-G]

Please be more descriptive in the titles for your pr's. Thanks!

[cesswairimu]

Fantastic 🎉 thanks for working on this @imajit and sorry took so long to get this merged